LOW TEMPERATURE YOKE TYPE TUNNEL VALVE SENSOR

WIPO Patent Application WO2002101731

A3

A read head includes electrically conductive ferromagnetic first (Y1, 226) and second (Y2, 228) yoke layers and a tunnel valve sensor (201) which is recessed from the ABS and is located between the first and second yoke layers. The first and second yoke layers extend to an air bearing surface (ABS) for conducting flux to the sensor and extend into the head beyond the sensor. A bottom copper structure (246) interfaces a bottom surface of the tunnel valve sensor and a top copper structure (248) interfaces a top surface of the tunnel valve sensor. In a first embodiment of the invention, the first and second copper structures conduct heat from the sensor to the first and second yoke layers respectively, and in a second embodiment of the invention the bottom copper structure conducts heat to a substrate (245) while the top copper structure conducts from the sensor to the second yoke layer. Further, in the first embodiment the first and second yoke layers serve as leads for a tunneling current while in the second embodiment the bottom copper structure and the second yoke layer serve as leads for the tunneling current.

GILL HARDAYAL SINGH

PCT/GB2002/002667

May 22, 2003

May 30, 2002

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IBM (US)
IBM UK (GB)

G11B5/39; G11B5/31; G11B5/40; (IPC1-7): G11B5/39; G11B5/012

WO1999022368A2	1999-05-06
WO2000005712A1	2000-02-03

US5486967A	1996-01-23
US5493467A	1996-02-20
US5898547A	1999-04-27

PATENT ABSTRACTS OF JAPAN vol. 2000, no. 06 22 September 2000 (2000-09-22)
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 03 31 March 1999 (1999-03-31)
PATENT ABSTRACTS OF JAPAN vol. 017, no. 471 (P - 1601) 26 August 1993 (1993-08-26)

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