US20010019464A1 - Wear resistant magnetic write head - Google Patents
Wear resistant magnetic write head Download PDFInfo
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- US20010019464A1 US20010019464A1 US09/811,070 US81107001A US2001019464A1 US 20010019464 A1 US20010019464 A1 US 20010019464A1 US 81107001 A US81107001 A US 81107001A US 2001019464 A1 US2001019464 A1 US 2001019464A1
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- Prior art keywords
- head
- recording surface
- wear resistant
- resistant material
- tape
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/584—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on tapes
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/62—Maintaining desired spacing between record carrier and head
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/255—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for protection against wear
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/488—Disposition of heads
- G11B5/4893—Disposition of heads relative to moving tape
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/581—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following maintaining desired contact or spacing by direct interaction of forces generated between heads or supports thereof and record carriers or supports thereof, e.g. attraction-repulsion interactions
Definitions
- Excessive wear can generate debris that can clog the tape/head interface at recording surface 102 or scratch tape 112 . Excessive wear can also alter the shape of the head at leading and trailing edges 106 and 108 resulting in an undesirable contour with increased tape/head spacing. Moreover, excessive wear may cause the thin magnetic layer 104 to peel if its edge coincides with the head/tape contact region at leading and trailing edges 106 and 108 .
- the present invention is directed to a head in which the leading and/or trailing edges are constructed with wear resistant material to reduce wear at the locations where the tape contacts the head while minimizing any adverse effects on the performance of the head that is recording servo data on the tape.
- a localized layer of wear resistant material is formed on the leading edge where the tape contacts the head before passing over the head recording surface.
- the leading edge is formed from wear resistant material embedded in the head structure adjacent to the recording surface.
- the leading edge is formed as a wear resistant material strip affixed to the side of the head structure.
- the wear resistant material may also be applied in the manner described to the trailing edge where the tape may also contact the head after passing over the recording surface.
- FIG. 1 is a perspective partial section view of a servo write head described in application Ser. No. 08/959,509, filed Oct. 28, 2997, titled Batch Fabricated Servo Write Head.
- FIG. 2 is an end section view of the servo write head of FIG. 1.
- FIG. 3 is a perspective partial section view of a servo write head constructed according to one embodiment of the invention in which a localized layer of wear resistant material is formed on the head at the leading and trailing edges.
- FIG. 4 is an end section view of the servo write head of FIG. 3.
- FIG. 6 is an end section view of a servo write head constructed according to a third embodiment of the invention in which a wear resistant material is formed along each side of the head at the leading and trailing edges.
- FIG. 8 is a perspective view of an individual head structure cut from the wafer of FIG. 7.
- FIG. 9 is a perspective view of a ferrite wafer from which individual head structures are cut during a batch fabrication process in which the wear resistant material strips extend the full height of the wafer.
- FIG. 10 is a perspective view of an individual head structure cut from the wafer of FIG. 9.
- the present invention is not intended to be limited to use in only servo write head.
- the present invention may be used for any magnetic read or write or read/write head.
- Magnetic gaps 20 are formed in a desired pattern near the center of head 1 0 to record servo information on tape 12 .
- “Formed” or “form” or “forming” as those terms are used in this Specification and in the claims refers generally to any process in which materials are applied, removed or otherwise processed to obtain the desired structure. Additive forming processes include, for example, deposition, plating and the like. Subtractive processes include, for example, etching, cutting, ablating and the like.
- Gaps 20 are formed in layer 22 of high moment magnetic material formed over a non-magnetic spacer 24 as described in application Ser. No. 08/959,509. Suitable materials for layer 22 include, for example, iron aluminum nitride (FeAIN), iron tantalum nitride (FeTaN) and nickel iron (NiFe).
- Head 10 includes a horseshoe shaped area 28 of magnetic material, typically ferrite, separated by non-magnetic spacer 24 .
- Spacer 24 may be made of any suitable non-magnetic material such as glass, calcium-titanite or even air.
- a coil of conductive windings 34 is wound around a portion of horseshoe area 28 , generally along the side as shown in FIGS. 3 - 6 .
- the width of spacer 24 will typically be 100-500 microns.
- the magnetic flux produced by the write current is then largely confined to magnetic layer 22 .
- a layer 38 of wear resistant material is formed at leading and trailing edges 14 and 16 where tape 12 contacts head 10 .
- Wear layers 38 cover leading edge 14 and trailing edge 16 .
- wear layers 38 should also cover transition areas 40 and 42 .
- Any suitable wear resistant material that can be made to adhere to, bond with or otherwise be applied to head structures (ferrite areas 28 and magnetic layer 22 in FIGS. 3 and 4) may be used for wear layers 38 .
- Diamond-Like carbon for example, is one material suitable for wear layers 38 .
- Diamond-Like carbon wear layers up to the order of 1.0 micron thick could be used without adversely affecting the spacing between head 10 and tape 12 at gaps 20 .
- the thickness of wear layers 38 may vary depending on such factors as tape speed, head curvature, the degree of wear resistance of the wear resistant material and various processing parameters.
- wear layers 38 will usually be formed after magnetic layer 22 .
- Wear layers 38 may be formed by deposition, lamination, plating, growing and similar techniques well known to those skilled in the art of thin film fabrication.
- the center portion of head 10 is masked or otherwise protected during the formation of wear layers 38 to keep the recording surface free of wear resistant material to avoid spacing loss.
- the wear resistant material may be etched back to the leading edge areas to clear the writing area of the head.
- FIGS. 5 and 6 illustrate alternative embodiments of the invention in which wear resistant material blocks 44 (in FIG. 5) and strips 48 (in FIG. 6) are formed along each side of head 10 at leading and trailing edges 14 and 16 .
- Blocks 44 and strips 48 which represent two shape variations of the same basic configuration, are made of aluminum oxide-titanium carbide (Al 2 O 3 —TiC) or another suitable wear resistant material. Other shape variations are possible.
- a round rod for example, could also be inserted into head 10 at the leading and trailing edges 14 and 16 .
- wear blocks 44 are formed in recesses 46 sculptured in ferrite areas 28 . Wear blocks 44 may be formed before or after formation of magnetic layer 22 . Wear blocks 44 may be formed as prefabricated inserts placed in recesses 46 or by filling the recesses and then shaping the blocks. Other suitable formation techniques could also be used. Wear blocks 44 are contoured to form the desired leading and trailing edges 14 and 16 as described in application Ser. No. 08/959,509.
- wear strips 48 are laminated or otherwise affixed or bonded to sides 50 and 52 of ferrite areas 28 . Wear strips 48 may be formed before or after formation of magnetic layer 22 . Like the wear blocks described above, wear strips 48 are contoured to form the desired leading and trailing edges 14 and 16 as described in application Ser. No. 08/959,509.
- FIGS. 7 and 8 and 9 and 10 show a laminated wafer 54 that includes layers of ferrite 56 , wear resistant material 58 and non-magnetic material 60 .
- wear resistant material 58 extends only along the top portion of wafer 54 .
- wear resistant material 58 extends the full height of wafer 54 .
- the ferrite and non-magnetic layers on wafer 54 in FIGS. 7 and 9 have already been formed into the general shape of multiple heads 10 . As shown in FIGS.
- each head 10 is sawn lengthwise from wafer 54 by cutting through wear layers 58 as indicated by the dotted lines in FIGS. 7 and 9 (any cross cuts will cross wear layer 58 ). Wear layers 58 can then be contoured as described above to form the desired leading and trailing edges 14 and 16 .
Abstract
A head design that reduces wear at the leading and trailing edges where the tape contacts the head while minimizing any adverse effects on the performance of the head. In one embodiment of the invention, a localized layer of wear resistant material is formed on the leading edge where the tape contacts the head before passing over the head recording surface. In a second embodiment, the leading edge is formed as wear resistant material embedded in the head structure adjacent to the recording surface. And, in a third embodiment, the leading edge is formed as a wear resistant material strip affixed to the side of the head structure. For each embodiment, the wear resistant material may also be applied in the manner described to the trailing edge where the tape may also contact the head after passing over the recording surface.
Description
- This is a continuation in part of application Ser. No. 08/959,509, filed Oct. 28, 1997, titled Batch Fabricated Servo Write Head which is incorporated herein by reference in its entirety.
- The invention relates in general to recording/writing on magnetic storage media and, more particularly, to an improved servo write head for writing servo patterns on magnetic tape.
- With ever denser data, recording and reading data on magnetic storage media requires increasingly precise positioning of magnetic read and write heads. Data is often written in parallel tracks. The read/write heads must be moved quickly and positioned over particular data tracks as data is read or recorded. The magnetic heads record and read data as relative movement occurs between the heads and the magnetic storage media in a transducing, usually lengthwise, direction. The heads are generally moved from one track to another track across the width of the tracks in a translating direction. For example, a magnetic tape typically contains data tracks that extend along the length of the tape parallel to the tape edges in the transducing direction. The heads move from track to track in the translating direction across the tape from edge to edge.
- Storage devices that read and record data on magnetic media can use servo control systems to properly position the heads in the translating direction. High performance linear tape drives are beginning to implement closed-loop servo systems for track following in order to record at high area densities. The servo control systems derive a position signal from a magnetic servo read head that reads servo position information recorded in servo tracks on the storage media. Servo position information is recorded on magnetic tapes, for example, as part of the pre-formatting process between manufacture of raw blank tape and end user packaged tape cartridges. A magnetic servo write head in a servo writer machine records the servo information on the tape, usually in bulk before the tape is cut and assembled into cartridges. One such servo write head and a corresponding servo position system is described in U.S. Pat. No. 5,689,384 titled Timing Based Servo System For Magnetic Tape Systems.
- U.S. patent application Ser. No. 08/959,509 titled Batch Fabricated Servo Write Head describes a servo write head that may be fabricated in batches rather than individually as in prior art servo write heads. Referring to FIGS. 1 and 2, the batch fabricated servo write
head 100 of the '509 application includes a flattape recording surface 102 on athin layer 104 of high moment magnetic material and rounded leading andtrailing edges Servo patterning gaps 110 are formed inlayer 104 at the center ofbearing surface 102. Tape 112contacts head 100 at the leading andtrailing edges tape 112. Excessive wear can generate debris that can clog the tape/head interface at recordingsurface 102 orscratch tape 112. Excessive wear can also alter the shape of the head at leading andtrailing edges magnetic layer 104 to peel if its edge coincides with the head/tape contact region at leading andtrailing edges - Prior solutions to the problem of excessive head wear generally include the widened head pads described in U.S. Pat. No. 5,055,959 titled Tape Head With Low Spacing Loss Produced By Narrow And Wide Wear Regions, applying wear resistant coatings to the entire head, and the “contact” head described in the '384 patent. The '959 patent describes a servo write head that utilizes widened pads to reduce the contact pressure between the tape and the head. Widened head pads, however, are not practical in radiused edge/flat servo write heads such as the batch fabricated heads shown in FIGS. 1 and 2. Although the application of a wear resistant coating to the entire head as shown in FIG. 14 of the '509 may be effective in reducing wear, the coating is less desirable because it increases the magnetic spacing between the tape and the head which may reduce the effectiveness of the head recording servo patterns on the tape. The contact head described in the '384 patent, which presumably just wears down until it no longer functions, is undesirable due to the comparatively short useful life and the potential changes to the recording characteristics as the head wears.
- Accordingly, the present invention is directed to a head in which the leading and/or trailing edges are constructed with wear resistant material to reduce wear at the locations where the tape contacts the head while minimizing any adverse effects on the performance of the head that is recording servo data on the tape. In one embodiment of the invention, a localized layer of wear resistant material is formed on the leading edge where the tape contacts the head before passing over the head recording surface. In a second embodiment, the leading edge is formed from wear resistant material embedded in the head structure adjacent to the recording surface. And, in a third embodiment, the leading edge is formed as a wear resistant material strip affixed to the side of the head structure. For each embodiment, the wear resistant material may also be applied in the manner described to the trailing edge where the tape may also contact the head after passing over the recording surface.
- The use of wear resistant materials at the leading and trailing edges as summarized above will reduce wear while helping to maintain the desired spacing between the head recording surface and the tape over the full life of the head. The invention should also help reduce or eliminate debris from the head that might otherwise be generated during the servo recording process which, in turn, should help minimize head clogging and tape scratching. For those types of heads that use a thin layer of magnetic material embedded in or applied to the head structure at the recording surface, such as that shown in FIGS. 1 and 2, the invention should help reduce or eliminate the potential for this magnetic layer to delaminate from the base head structure at the leading or trailing edges.
- FIG. 1 is a perspective partial section view of a servo write head described in application Ser. No. 08/959,509, filed Oct. 28, 2997, titled Batch Fabricated Servo Write Head.
- FIG. 2 is an end section view of the servo write head of FIG. 1.
- FIG. 3 is a perspective partial section view of a servo write head constructed according to one embodiment of the invention in which a localized layer of wear resistant material is formed on the head at the leading and trailing edges.
- FIG. 4 is an end section view of the servo write head of FIG. 3.
- FIG. 5 is an end section view of a servo write head constructed according to a second embodiment of the invention in which a wear resistant material is embedded in the head at the leading and trailing edges.
- FIG. 6 is an end section view of a servo write head constructed according to a third embodiment of the invention in which a wear resistant material is formed along each side of the head at the leading and trailing edges.
- FIG. 7 is perspective view of a ferrite wafer from which individual head structures are cut during a batch fabrication process.
- FIG. 8 is a perspective view of an individual head structure cut from the wafer of FIG. 7.
- FIG. 9 is a perspective view of a ferrite wafer from which individual head structures are cut during a batch fabrication process in which the wear resistant material strips extend the full height of the wafer.
- FIG. 10 is a perspective view of an individual head structure cut from the wafer of FIG. 9.
- Cross hatching has been omitted from many of the section views for clarity.
- While the below description describes a servo write, the present invention is not intended to be limited to use in only servo write head. The present invention may be used for any magnetic read or write or read/write head.
- FIGS. 3 and 4 illustrate a servo write
head 10 constructed according to one embodiment of the invention in which a wear resistant material is formed on the head at the leading and trailing edges where the tape may contact the head. Referring to FIGS. 2 and 3,magnetic recording tape 12contacts head 10 at a curved leadingedge 14 and a curvedtrailing edge 16.Tape 12 travels over aflat recording surface 18 at the center ofhead 12 supported by an air bearing formed in thespace 19 betweentape 12 andhead 10. “Recording surface” as that term is used in this Specification and in the claims refers generally to the planar area including the center portion of the head in which magnetic flux is generated to record servo patterns on to the tape.Magnetic gaps 20 are formed in a desired pattern near the center of head 1 0 to record servo information ontape 12. “Formed” or “form” or “forming” as those terms are used in this Specification and in the claims refers generally to any process in which materials are applied, removed or otherwise processed to obtain the desired structure. Additive forming processes include, for example, deposition, plating and the like. Subtractive processes include, for example, etching, cutting, ablating and the like.Gaps 20 are formed inlayer 22 of high moment magnetic material formed over anon-magnetic spacer 24 as described in application Ser. No. 08/959,509. Suitable materials forlayer 22 include, for example, iron aluminum nitride (FeAIN), iron tantalum nitride (FeTaN) and nickel iron (NiFe). -
Head 10 includes a horseshoe shapedarea 28 of magnetic material, typically ferrite, separated bynon-magnetic spacer 24.Spacer 24 may be made of any suitable non-magnetic material such as glass, calcium-titanite or even air. - A coil of
conductive windings 34 is wound around a portion ofhorseshoe area 28, generally along the side as shown in FIGS. 3-6. The width ofspacer 24 will typically be 100-500 microns. The magnetic flux produced by the write current is then largely confined tomagnetic layer 22. - In the embodiment of the invention shown in FIGS. 3 and 4, a
layer 38 of wear resistant material is formed at leading and trailingedges tape 12contacts head 10. Wear layers 38cover leading edge 14 and trailingedge 16. For head designs in whichtransition areas magnetic layer 22 andferrite areas 28 are at or very near leading and trailingedges layers 38 should also covertransition areas ferrite areas 28 andmagnetic layer 22 in FIGS. 3 and 4) may be used for wear layers 38. Diamond-Like carbon, for example, is one material suitable for wear layers 38. It is expected from simulation modeling that Diamond-Like carbon wear layers up to the order of 1.0 micron thick could be used without adversely affecting the spacing betweenhead 10 andtape 12 atgaps 20. The thickness of wear layers 38 may vary depending on such factors as tape speed, head curvature, the degree of wear resistance of the wear resistant material and various processing parameters. - In the batch fabrication processes described in application Ser. No. 08/959,509, wear
layers 38 will usually be formed aftermagnetic layer 22. Wear layers 38 may be formed by deposition, lamination, plating, growing and similar techniques well known to those skilled in the art of thin film fabrication. The center portion ofhead 10 is masked or otherwise protected during the formation of wear layers 38 to keep the recording surface free of wear resistant material to avoid spacing loss. Alternatively, if the wear resistant material is applied fully across the head, it may be etched back to the leading edge areas to clear the writing area of the head. - FIGS. 5 and 6 illustrate alternative embodiments of the invention in which wear resistant material blocks44 (in FIG. 5) and strips 48 (in FIG. 6) are formed along each side of
head 10 at leading and trailingedges Blocks 44 and strips 48, which represent two shape variations of the same basic configuration, are made of aluminum oxide-titanium carbide (Al2O3—TiC) or another suitable wear resistant material. Other shape variations are possible. A round rod, for example, could also be inserted intohead 10 at the leading and trailingedges - In the batch fabrication processes described in application Ser. No. 08/959,509, wear blocks44 are formed in
recesses 46 sculptured inferrite areas 28. Wear blocks 44 may be formed before or after formation ofmagnetic layer 22. Wear blocks 44 may be formed as prefabricated inserts placed inrecesses 46 or by filling the recesses and then shaping the blocks. Other suitable formation techniques could also be used. Wear blocks 44 are contoured to form the desired leading and trailingedges - In the batch fabrication processes described in application Ser. No. 08/959,509, wear
strips 48 are laminated or otherwise affixed or bonded tosides ferrite areas 28. Wear strips 48 may be formed before or after formation ofmagnetic layer 22. Like the wear blocks described above, wearstrips 48 are contoured to form the desired leading and trailingedges - One technique that might be used to form wear strips48 are part of a batch fabrication process for
multiple heads 10 is illustrated in FIGS. 7 and 8 and 9 and 10. FIGS. 7 and 9 show alaminated wafer 54 that includes layers offerrite 56, wearresistant material 58 andnon-magnetic material 60. In FIG. 7, wearresistant material 58 extends only along the top portion ofwafer 54. In FIG. 9,wearresistant material 58 extends the full height ofwafer 54. The ferrite and non-magnetic layers onwafer 54 in FIGS. 7 and 9 have already been formed into the general shape ofmultiple heads 10. As shown in FIGS. 8 and 10, eachhead 10 is sawn lengthwise fromwafer 54 by cutting throughwear layers 58 as indicated by the dotted lines in FIGS. 7 and 9 (any cross cuts will cross wear layer 58). Wear layers 58 can then be contoured as described above to form the desired leading and trailingedges - While the present invention has been shown and described with reference to the foregoing embodiments, it is to be understood that other forms and details may be made thereto without departing from the spirit and scope of the invention. For example, the use of a wear resistant film covering the leading edges or forming the leading edges from a wear resistant material is not limited to the radiused edge/ flat profile type head shown and described. Also, while it is expected the invention can be most readily implemented through the batch fabrication techniques described in application Ser. No. 08/959,509, the invention could be used in heads that are manufactured individually. The invention could also be useful for wear reduction with other head contours. It should be understood, therefore, that the invention is to be construed broadly within the scope of the following claims.
Claims (20)
1. A head for magnetic tape, comprising:
a recording surface;
a rounded leading edge disposed adjacent to the recording surface such that the tape contacts the leading edge before passing over the recording surface; and
a first layer of wear resistant material on the leading edge.
2. The head of , further comprising:
claim 1
a rounded trailing edge disposed adjacent to the recording surface such that the tape passes over the trailing edge after passing over the recording surface; and
a second layer of wear resistant material on the trailing edge.
3. The head of , wherein the wear resistant material comprises Diamond-Like carbon.
claim 1
4. The head of , wherein the recording surface is substantially planar and further comprising an air bearing between the recording surface and the tape.
claim 1
5. The head of , wherein the wear resistant material comprises Diamond-Like carbon.
claim 2
6. A head for magnetic tape, comprising:
a head structure;
a recording surface along the head structure; and
a rounded leading edge comprising wear resistant material embedded in the head structure adjacent to the recording surface such that the tape contacts the leading edge before passing over the recording surface.
7. The head of , wherein the wear resistant material comprises aluminum oxide-titanium carbide (Al2O3—TiC).
claim 6
8. The head of , further comprising a rounded trailing edge comprising wear resistant material embedded in the head structure adjacent to the recording surface such that the tape passes over the trailing edge after passing over the recording surface.
claim 6
9. The head of , wherein the recording surface is substantially planar and further comprising an air bearing between the recording surface and the tape.
claim 6
10. The head of , wherein the wear resistant material comprises aluminum oxide-titanium carbide (Al2O3—TiC).
claim 8
11. A head for magnetic tape, comprising:
a head structure;
a recording surface along the head structure; and
a rounded leading edge comprising a wear resistant material strip disposed on a first side of the head structure adjacent to the recording surface such that the tape contacts the leading edge before passing over the recording surface.
12. The head of , wherein the wear resistant material comprises aluminum oxide-titanium carbide (A1 2O3—TiC).
claim 11
13. The head of , further comprising a rounded trailing edge comprising a wear resistant material strip disposed on a second side of the head structure adjacent to the recording surface such that the tape passes over the trailing edge after passing over the recording surface.
claim 11
14. The head of , wherein the recording surface is substantially planar and further comprising an air bearing between the recording surface and the tape.
claim 11
15. The head of , wherein the wear resistant material comprises aluminum oxide-titanium carbide (Al2O3—TiC).
claim 13
16. A head for magnetic tape, comprising:
a composite head structure having a first ferrite portion, a second ferrite portion and a non-magnetic spacer between the first and second ferrite portions;
a layer of magnetic material disposed along the head structure, the layer of magnetic material having at least one gap therein located over the spacer;
a recording surface defined by the layer of magnetic material, the gap located at a writing area of the recording surface;
a rounded leading edge comprising wear resistant material disposed adjacent to the recording surface such that the tape contacts the leading edge before passing over the recording surface; and
a rounded trailing edge comprising wear resistant material disposed adjacent to the recording surface such that the tape contacts the trailing edge after passing over the recording surface.
17. The head of , wherein the leading edge comprises a layer of wear resistant material on the first ferrite portion and the trailing edge comprises a layer of wear resistant material on the second ferrite portion.
claim 16
18. The head of , wherein the leading edge comprises a first piece of wear resistant material embedded in the first ferrite portion and the trailing edge comprises a second piece of wear resistant material embedded in the second ferrite portion.
claim 16
19. The head of , wherein the leading edge comprises a first strip of wear resistant material affixed to a side of the first ferrite portion and the trailing edge comprises a second strip of wear resistant material affixed to a side of the second ferrite portion.
claim 16
20. The head of , wherein the recording surface is a substantially planar surface and the head further comprises an air bearing between the recording surface and the tape.
claim 16
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/811,070 US6373656B2 (en) | 1997-10-28 | 2001-03-16 | Wear resistant magnetic write head |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/959,509 US6018444A (en) | 1997-10-28 | 1997-10-28 | Batch fabricated servo write head having low write-gap linewidth variation |
US09/313,889 US6236537B1 (en) | 1997-10-28 | 1999-05-18 | Wear resistant magnetic write head |
US09/811,070 US6373656B2 (en) | 1997-10-28 | 2001-03-16 | Wear resistant magnetic write head |
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US09/313,889 Continuation US6236537B1 (en) | 1997-10-28 | 1999-05-18 | Wear resistant magnetic write head |
US09/313,889 Division US6236537B1 (en) | 1997-10-28 | 1999-05-18 | Wear resistant magnetic write head |
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Publication Number | Publication Date |
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US20010019464A1 true US20010019464A1 (en) | 2001-09-06 |
US6373656B2 US6373656B2 (en) | 2002-04-16 |
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US09/313,889 Expired - Lifetime US6236537B1 (en) | 1997-10-28 | 1999-05-18 | Wear resistant magnetic write head |
US09/811,070 Expired - Fee Related US6373656B2 (en) | 1997-10-28 | 2001-03-16 | Wear resistant magnetic write head |
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US09/313,889 Expired - Lifetime US6236537B1 (en) | 1997-10-28 | 1999-05-18 | Wear resistant magnetic write head |
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US (2) | US6236537B1 (en) |
JP (2) | JP2000339619A (en) |
GB (1) | GB2353136B (en) |
HK (1) | HK1031026A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070109681A1 (en) * | 2005-11-16 | 2007-05-17 | International Business Machines Corporation | Magnetic reader with piggybacked fence |
US8611044B2 (en) | 2011-06-02 | 2013-12-17 | International Business Machines Corporation | Magnetic head having separate protection for read transducers and write transducers |
US8724250B2 (en) | 2012-04-03 | 2014-05-13 | Hewlett-Packard Development Company, L.P. | Reading magnetic tape |
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CN1273664A (en) * | 1998-07-13 | 2000-11-15 | 皇家菲利浦电子有限公司 | Method of manufacturing thin-film magnetic head |
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1999
- 1999-05-18 US US09/313,889 patent/US6236537B1/en not_active Expired - Lifetime
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2000
- 2000-05-16 GB GB0011815A patent/GB2353136B/en not_active Expired - Fee Related
- 2000-05-18 JP JP2000146090A patent/JP2000339619A/en active Pending
-
2001
- 2001-03-13 HK HK01101799A patent/HK1031026A1/en not_active IP Right Cessation
- 2001-03-16 US US09/811,070 patent/US6373656B2/en not_active Expired - Fee Related
-
2003
- 2003-04-30 JP JP2003125932A patent/JP2004005960A/en active Pending
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US8724250B2 (en) | 2012-04-03 | 2014-05-13 | Hewlett-Packard Development Company, L.P. | Reading magnetic tape |
US9053723B2 (en) | 2012-04-27 | 2015-06-09 | International Business Machines Corporation | Magnetic recording head having quilted-type coating |
US8837082B2 (en) * | 2012-04-27 | 2014-09-16 | International Business Machines Corporation | Magnetic recording head having quilted-type coating |
US9036297B2 (en) | 2012-08-31 | 2015-05-19 | International Business Machines Corporation | Magnetic recording head having protected reader sensors and near zero recession writer poles |
US9343097B2 (en) | 2012-08-31 | 2016-05-17 | International Business Machines Corporation | Method of forming magnetic recording head having protected reader sensors and near zero recession writer poles |
US9449620B2 (en) | 2012-08-31 | 2016-09-20 | International Business Machines Corporation | Magnetic recording head having protected reader sensors and near zero recession writer poles |
US9659583B2 (en) | 2012-08-31 | 2017-05-23 | International Business Machines Corporation | Magnetic recording head having protected reader sensors and near zero recession writer poles |
US10199058B2 (en) | 2012-08-31 | 2019-02-05 | International Business Machines Corporation | Method of forming magnetic recording head having protected reader sensors and near zero recession writer poles |
US8780496B2 (en) | 2012-09-21 | 2014-07-15 | International Business Machines Corporation | Device such as magnetic head having hardened dielectric portions |
US11682419B2 (en) | 2021-08-13 | 2023-06-20 | Western Digital Technologies, Inc. | Magnetic head with assisted magnetic recording |
Also Published As
Publication number | Publication date |
---|---|
US6373656B2 (en) | 2002-04-16 |
GB2353136A (en) | 2001-02-14 |
GB0011815D0 (en) | 2000-07-05 |
JP2004005960A (en) | 2004-01-08 |
JP2000339619A (en) | 2000-12-08 |
HK1031026A1 (en) | 2001-05-25 |
US6236537B1 (en) | 2001-05-22 |
GB2353136B (en) | 2003-08-06 |
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