# US 8,786,986 B2 · Head-slider including thin-film magnetic-recording head having reduced thermal protrusion

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- Number: US 8,786,986 B2
- Document ID: US8786986B2
- Status: Granted
- Kind: B2
- Application number: 12/642,739
- Filed: 2009-12-18
- Published: 2011-05-19
- Granted: 2014-07-22
- Earliest claimed: 2008-12-19
- Assignees: HGST Netherlands B.V.
- Applicants: Shigeo Fujita; Masahiko Soga; Hideaki Tanaka; Yuji Ueda; Tomohiro Okada; Takayoshi Ohtsu; Wataru Kimura; Yohji Maruyama
- Inventors: Shigeo Fujita; Masahiko Soga; Hideaki Tanaka; Yuji Ueda; Tomohiro Okada; Takayoshi Ohtsu; Wataru Kimura; Yohji Maruyama
- Web page: https://patentgrep.com/patent/US8786986B2

## CPC

- G11B 5/1278: {specially adapted for magnetisations perpendicular to the surface of the record carrier}
- G11B 5/3133: {including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure (G11B5/3106 takes precedence)}
- G11B 5/3136: {for reducing the pole-tip-protrusion at the head transducing surface, e.g. caused by thermal expansion of dissimilar materials}
- G11B 5/3967: {Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read (G11B5/3906 takes precedence)}
- G11B 5/6005: {Specially adapted for spacing from a rotating disc using a fluid cushion}
- G11B 5/6064: {using air pressure}
- G11B 2005/0005: {Arrangements, methods or circuits}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A head-slider. The head-slider includes a slider, and a thin-film magnetic-recording head. The thin-film magnetic-recording head includes: a read element; a write element; a non-magnetic insulating protective layer disposed around both read and write elements; a resist disposed at a position further away from an air-bearing surface than the read element; and, a hard-material member including a material selected from the group consisting of silicon carbide and tungsten, which is disposed at a position further away from the air-bearing surface than the read element and the write element. Both an end of the resist and an end of the hard-material member overlap the write element when viewed in a stacking direction. A ratio of a distance from the air-bearing surface to a deepest end of the hard-material member to a distance from the air-bearing surface to a deepest end of the resist is at least 0.9.

## Claims

### Claim 1

A head-slider comprising:
a slider; and
a thin-film magnetic-recording head formed by stacking a plurality of layers on said slider, said thin-film magnetic-recording head comprising:
a read element for reading data;
a write element for writing data;
a non-magnetic insulating protective singular layer disposed around said read element and said write element, such that said non-magnetic insulating protective singular layer surrounds said read element and said write element;
a resist disposed at a position further away from an air-bearing surface than said read element, an end of said resist on an air-bearing surface side overlapping said write element when viewed in a stacking direction of said thin-film magnetic-recording head; and
a hard-material member having a thickness less than said resist and disposed directly adjacent to said resist and extending in a vertical direction away from said air-bearing surface farther than said resist and comprising a material selected from the group consisting of silicon carbide and tungsten, which is disposed at a position further away from said air-bearing surface than said read element and said write element, an end of said hard-material member on said air-bearing surface side overlapping said write element when viewed in a stacking direction of said thin-film magnetic-recording head, and a ratio of a distance from said air-bearing surface to a deepest end of said hard-material member to a distance from said air-bearing surface to a deepest end of said resist being at least 0.9.

### Claim 2 (depends on 1)

The head-slider of claim 1, further comprising:
a coil for generating a magnetic field, said coil being formed by connecting conductive lines in an upper layer and conductive lines in a lower layer;
wherein said resist is disposed behind said conductive lines in said lower layer.

### Claim 3 (depends on 2)

The head-slider of claim 2, wherein said hard-material member is disposed in a lower layer than said conductive lines in said upper layer.

### Claim 4

A head-slider comprising:
a slider; and
a thin-film magnetic-recording head formed by stacking a plurality of layers on said slider, said thin-film magnetic-recording head comprising:
a read element for reading data;
a write element for writing data;
a non-magnetic insulating protective singular layer disposed around said read element and said write element, such that said non-magnetic insulating protective singular layer surrounds said read element and said write element;
a resist disposed at a position further away from an air-bearing surface than said read element and said write element;
a hard-material member having a thickness less than said resist and disposed directly adjacent to said resist and extending in a vertical direction away from said air-bearing surface farther than said resist and comprising a material selected from the group consisting of silicon carbide and tungsten, which is disposed at a position further away from said air-bearing surface than said read element and said write element; and
a lower shield and an upper shield sandwiching said read element above and under said read element, a ratio of a cross-sectional area of said resist to said cross-sectional areas of said lower shield and said upper shield being at least 3.5.

### Claim 5 (depends on 4)

The head-slider of claim 4, further comprising:
a coil for generating a magnetic field, said coil being formed by connecting conductive lines in an upper layer and conductive lines in a lower layer;
wherein said resist is disposed behind said conductive lines in said lower layer.

### Claim 6 (depends on 5)

The head-slider of claim 5, wherein
said hard-material member is disposed in a lower layer than said conductive lines in said upper layer.