MAGNETIC TUNNEL JUNCTION MAGNETO-RESISTANCE READ HEAD

Japanese Patent JP3004007

B2

PROBLEM TO BE SOLVED: To provide a magnetic tunnel junction magneto-resistance reading head for magnetic recording system which gives a large output signal.
SOLUTION: The magneto-resistance read head is provided with an MTJ detection or free ferromagnetic layer 132 functioning as a magnetic flux guide which directs a magnetic flux from a magnetic recording medium to a tunnel junction 100, and an MTJ fixed ferromagnetic layer 118 and an MTJ tunnel barrier layer 120 are provided with front edge parts 206 and 210 which are approximately level with the detection surface of the head, and the fixed ferromagnetic layer 118 and the free ferromagnetic layer 132 are brought into contact with opposite faced of the MTJ tunnel barrier layer 120, and the free ferromagnetic layer 132 is extended beyond the rear edge part of one of the free ferromagnetic layer 132 and the tunnel barrier layer 118 which has the rear edge part 208 or 212 nearer to the detection surface, and it is secured that the magnetic flux is non-zero in the tunnel junction area. The direction of magnetization of the fixed ferromagnetic layer 118 is fixed in the direction perpendicular to the detection surface by surface exchange coupling with an antiferromagnetic layer 116. The direction of magnetization of the free ferromagnetic layer 132 is made parallel with the surface of a medium when an applied magnetic field is zero, and it is freely rotated when an applied magnetic field exists.

Robert Edward Fontana Jr.
Stuart Stephen Papworth Perkin
Chin Hua Tsang
Mason Lamar Williams

JP28901398A

January 31, 2000

October 12, 1998

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International Business Machines Corporation

G11B5/39; G11B5/33; (IPC1-7): G11B5/39

JP4103014A

Hiroshi Sakaguchi (1 person outside)

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