# US 8,568,908 B2 · Method for manufacturing magnetic film and magnetic film

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- Number: US 8,568,908 B2
- Document ID: US8568908B2
- Status: Granted
- Kind: B2
- Application number: 11/765,069
- Filed: 2007-06-19
- Published: 2008-03-20
- Granted: 2013-10-29
- Earliest claimed: 2006-09-15
- Assignees: TDK Corporation
- Applicants: Kei Hirata; Atsushi Yamaguchi; Shingo Miyata
- Inventors: Kei Hirata; Atsushi Yamaguchi; Shingo Miyata
- Web page: https://patentgrep.com/patent/US8568908B2

## CPC

- G11B 5/3163: {Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers}
- C23C 26/00: Coating not provided for in groups C23C2/00 - C23C24/00
- C23C 28/021: {including at least one metal alloy layer}
- C23C 28/023: {only coatings of metal elements only}
- C25D 5/10: Electroplating with more than one layer of the same or of different metals (for bearings C25D7/10)
- C25D 5/18: Electroplating using modulated, pulsed or reversing current
- C25D 5/617: {Crystalline layers}
- C25D 7/001: {Magnets}
- H01F 41/26: using electric currents {, e.g. electroplating}
- G11B 5/3967: {Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read (G11B5/3906 takes precedence)}
- Y10T 428/115: Magnetic layer composition
- Y10T 428/1157: Substrate composition
- Y10T 428/12778: Alternative base metals from diverse categories
- 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)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for manufacturing a magnetic film includes preparing a foundation layer containing a noble metal element and a base metal element, and depositing a plated layer of a magnetic material on the foundation layer by pulse plating.

## Claims

### Claim 1

A thin-film magnetic head, comprising:
a write element;
a read element, and;
a slider supporting said write element and said read element, wherein
at least one of said write element and said read element includes a magnetic film including a foundation layer consisting of an alloy of a noble metal element and a base metal element, and a plated layer of a magnetic material substantially consisting of CoFe or NiFe formed on said foundation layer,
wherein said foundation layer is selected from a combination group of (Ru, Ti),
wherein a total amount of said base metal element in said foundation layer ranges from 5 to 20 atomic %, and
wherein said foundation layer has a lower standard electrode potential than a foundation layer of only said noble metal element to suppress an occurrence of pinholes in said plated layer when said plated layer is formed on said foundation layer.

### Claim 2 (depends on 1)

The thin-film magnetic head of claim 1, further comprising:
a second layer of a magnetic material formed directly on said plated layer, wherein said plated layer is formed directly on said foundation layer.