Title:
SPIN VALVE MAGNETO-RESISTIVE SENSOR AND MAGNETIC RECORDING SYSTEM USING THIS SENSOR
Document Type and Number:
Japanese Patent JP3180027
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a spin valve magneto-resistive (SVMR) sensor having an antiferromagnetic layer which is resistant to corrosion and is high in blocking temp. by using laminated antiparallel pin stopping layers in combination with the antiferromagnetic layer of an improved type.
SOLUTION: The antiferromagnetic layer(AF) 57 is nickel oxide and a layer 57 is formed on a seed layer 55. PF1/APC/PF2 laminated pin stopping layers 70 are formed on the layer 57. Two-layered ferromagnetic layers 72, 74 are formed of Co and are separated by antiparallel coupled(APC) films 73 of nonferromagnetic materials which are formed of Co and are equal or approximately equal in magnetic moment and antiferromagnetically strongly bond PF1 and PF2. The Co films 72, 74 in the layers 70 are oriented antiparallel in magnetization direction as shown by arrows 75, 76. The magnetic moments in the films 72, 74 are, therefore, negated by each other and the net magnetic moment in the layers 70 is extremely small or does not substantially exist. Consequently, the amplitude of high exchange magnetic fields is resulted.
Inventors:
Robert Edward Fontana, Jr.
Bruce Alvin Gurney
Tsang Lin
Virgil Simon Superiores
Chin Hua Tsang
Dennis Richard Willhoyt
Bruce Alvin Gurney
Tsang Lin
Virgil Simon Superiores
Chin Hua Tsang
Dennis Richard Willhoyt
Application Number:
JP15082696A
Publication Date:
June 25, 2001
Filing Date:
June 12, 1996
Export Citation:
Assignee:
International Business Machines Corporation
International Classes:
G01R33/09; G11B5/39; H01F10/32; H01L43/10; (IPC1-7): G11B5/39
Domestic Patent References:
| JP7169026A | ||||
| JP87235A |
Other References:
【文献】米国特許5465185(US,A)
【文献】欧州特許出願公開687917(EP,A2)
【文献】欧州特許出願公開687917(EP,A2)
Attorney, Agent or Firm:
Hiroshi Sakaguchi (1 person outside)