[특허]Tunnel valve sensor having a pinned layer structure with an iron oxide (Fe3O4) layer

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G11B-005/127
출원번호	US-0813855 (2001-03-20)
발명자 / 주소	Gill, Hardayal Singh
출원인 / 주소	International Business Machines Corporation
대리인 / 주소	Johnston, Ervin F.
인용정보	피인용 횟수 : 14 인용 특허 : 13

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In a tunnel junction sensor a free layer structure has a cobalt iron (Co90Fe10) layer and a half metallic iron oxide (Fe3O4) layer and a pinned layer structure has a cobalt iron (Co50Fe50) layer and a half metallic iron oxide (Fe3O4) layer. Each of the iron oxide layers interfaces a barrier layer wh

In a tunnel junction sensor a free layer structure has a cobalt iron (Co90Fe10) layer and a half metallic iron oxide (Fe3O4) layer and a pinned layer structure has a cobalt iron (Co50Fe50) layer and a half metallic iron oxide (Fe3O4) layer. Each of the iron oxide layers interfaces a barrier layer which is compatible therewith. The thicknesses of the iron oxide (Fe3O4) layers are less than the thicknesses of the other layers of the free and pinned layer structures.

대표청구항 ▼

In a tunnel junction sensor a free layer structure has a cobalt iron (Co90Fe10) layer and a half metallic iron oxide (Fe3O4) layer and a pinned layer structure has a cobalt iron (Co50Fe50) layer and a half metallic iron oxide (Fe3O4) layer. Each of the iron oxide layers interfaces a barrier layer wh

In a tunnel junction sensor a free layer structure has a cobalt iron (Co90Fe10) layer and a half metallic iron oxide (Fe3O4) layer and a pinned layer structure has a cobalt iron (Co50Fe50) layer and a half metallic iron oxide (Fe3O4) layer. Each of the iron oxide layers interfaces a barrier layer which is compatible therewith. The thicknesses of the iron oxide (Fe3O4) layers are less than the thicknesses of the other layers of the free and pinned layer structures. 10. A dual structure microactuator for positioning a transducing head relative to a select track of a disc, the dual structure microactuator comprising: a first structure having a stator and a rotor, wherein the rotor comprises a coil embedded into a surface of the rotor; and a second structure carrying a magnet and comprising mechanical stand-offs; wherein the first structure is attached to the second structure. 11. The dual structure microactuator of claim 10 wherein the mechanical stand-offs on the second structure are configured to form an air gap between the magnet carried on the second structure and the embedded coil on the first structure when the first structure is attached to the second structure. 12. The dual structure microactuator of claim 10 wherein the second structure is formed of a ferromagnetic keeper material. 13. The dual structure microactuator of claim 10 wherein the first structure further comprises a wire embedded into the surface of the rotor connecting the embedded coil on the rotor to a bond pad on the stator. 14. The dual structure microactuator of claim 13 wherein the first structure further comprises a flexible beam spring and the embedded wire is located on the flexible beam spring. 15. The dual structure microactuator of claim 10 wherein the first structure further comprises a keeper located between the embedded coil and a surface of the disc. 16. The dual structure microactuator of claim 10 wherein the embedded coil further comprises a jumper embedded into the surface of the rotor. 17. A dual structure microactuator having a stator and a rotor for finely positioning a slider above a surface of a disc, the dual structure microactuator comprising: a first structure comprising a coil embedded in a surface of the first structure so that the surface remains essentially planar; and a second structure comprising a magnet; wherein the second structure is attached to the first structure so that a gap is formed between the magnet of the second structure and the embedded coil of the first structure. 18. The dual structure microactuator of claim 17 wherein the second structure further comprises mechanical stand-offs to form the gap between the magnet of the second structure and the embedded coil of the first structure. 19. The dual structure microactuator of claim 17 wherein the first structure comprises the stator and rotor, and wherein the embedded coil is located on the rotor and further comprising embedded wires on the stator. 20. The dual structure microactuator of claim 17 and further comprising keepers located on the first and second structures. h other by a flexible hinge member. 5. A suspension for disc drive according to claim 2, wherein an extending portion extending along one of said side faces of the piezoelectric ceramic element is provided on a part of the hinge member, and said cover portion is formed along the extending portion. 6. A suspension for disc drive according to claim 5, wherein said extending portion includes a first portion, a second portion that faces the first portion, and a gap formed between the first and second portions. 7. A suspension for disc drive according to claim 2, wherein said covering material is an adhesive agent with an uncured-state viscosity ranging from 2 Pas to 1,000 Pas. 8. A suspension for disc drive according to claim 3, wherein said covering material is an adhesive agent with an uncured-state viscosity ranging from 2 Pas to 1,000 Pas. 9. A suspension for disc drive according to claim 4, wherein said covering material is an adhesive agent with an uncured-state viscosity ranging from 2 Pas to 1,000 Pas. 10. A suspension for disc drive according to claim 6, wherein said covering material is an adhesive agent with an uncured-state viscosity ranging from 2 Pas to 1,000 Pas. 11. A suspension for disc drive according to claim 2, wherein said covering material forming the cover portion comprises a same adhesive agent that is used to fix the piezoelectric ceramic element to the actuator base. 12. A suspension for disc drive according to claim 3, wherein said covering material forming the cover portion comprises a same adhesive agent that is used to fix the piezoelectric ceramic element to the actuator base. 13. A suspension for disc drive according to claim 4, wherein said covering material forming the cover portion comprises a same adhesive agent that is used to fix the piezoelectric ceramic element to the actuator base. 14. A suspension for disc drive according to claim 6, wherein said covering material forming the cover portion comprises a same adhesive agent that is used to fix the piezoelectric ceramic element to the actuator base.

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이 특허에 인용된 특허 (13) 인용/피인용 타임라인 분석

Slonczewski John Casimir (Katonah NY), Electronic device using magnetic components.
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Sato Masashige,JPX ; Kobayashi Kazuo,JPX ; Kikuchi Hideyuki,JPX, Ferromagnetic tunnel-junction magnetic sensor utilizing a barrier layer having a metal layer carrying an oxide film.
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Hardayal Singh Gill, Low uniaxial anisotropy cobalt iron (COFE) free layer structure for GMR and tunnel junction heads.
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Gallagher William Joseph ; Parkin Stuart Stephen Papworth ; Slonczewski John Casimir ; Sun Jonathan Zanhong, Magnetic tunnel junction device with antiferromagnetically coupled pinned layer.
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Parkin Stuart Stephen Papworth, Magnetic tunnel junction device with improved fixed and free ferromagnetic layers.
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Schep Cornelis M.,NLX ; Gijs Martinus A.M.,NLX, Magneto-resistive magnetic field sensor with a constricted region.
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Araki Satoru,JPX ; Sato Yuichi,JPX ; Shinoura Osamu,JPX, Magnetoresistance device.
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Takeda Hideki,JPX ; Katsumi Tetsuya,JPX, Magnetoresistive element and magnetic detector and use thereof.
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Chui Siu-Tat, Multiple magnetic tunnel structures.
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Brug James A. ; Bhattacharyya Manoj K. ; Tran Lung T. ; Anthony Thomas C., Robust recording head for near-contact operation.
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[미국특허] Tunnel valve sensor having a pinned layer structure with an iron oxide (Fe3O4) layer 원문보기

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[미국특허] Tunnel valve sensor having a pinned layer structure with an iron oxide (Fe3O4) layer 원문보기

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