Magnetic multilayer film and magnetoresistance element

Details Magnetic multilayer film and magnetoresistance element Magnetic multilayer film and magnetoresistance element

1993-06-23

1996-04-23

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

324252, 360110, 360113, 428694R, 428694T, 428694TM, 428900, B32B 702, G11B 566, G11B 570, G11B 5127

Patent

active

055101720

ABSTRACT:
A magnetic multilayer film having magnetoresistance (MR) is prepared by depositing at least two magnetic thin films having different coercive forces while interposing a non-magnetic thin film therebetween. A first magnetic thin film having a lower coercive force has a squareness ratio SQ.sub.1 and a thickness t.sub.1, a second magnetic thin film having a higher coercive force has a squareness ratio SQ.sub.2 and a thickness t.sub.2, and the non-magnetic thin film has a thickness t.sub.3. A first form of the invention requires 4 .ANG..ltoreq.t.sub.2 <30 .ANG., 20 .ANG.<t.sub.1 .ltoreq.200 .ANG., t.sub.1 >t.sub.2, t.sub.3 .ltoreq.200 .ANG., 0.7.ltoreq.SQ.sub.1 .ltoreq.1.0, and 0.1.ltoreq.SQ.sub.2 .ltoreq.0.8, thereby achieving a magnetic multilayer film which shows a great MR ratio of several percents under an external magnetic field of several Oe, an excellent rise across zero magnetic field and heat resistance. A second form of the invention requires 4 .ANG.<t.sub.2 <20 .ANG., 5 .ANG.<t.sub.1 .ltoreq.20 .ANG., t.sub.1 <t.sub.2 and 32 .ANG.<t.sub.3 <50 .ANG., thereby achieving a magnetic multilayer film which is increased in MR ratio, MR slope between -50 Oe and +50 Oe, and high-frequency MR slope while showing minimized hysteresis. There are obtained MR elements, typically high sensitivity MR sensors and MR heads capable of high density magnetic recording.

REFERENCES:
Proceedings of Magnetics Research Meeting of Japanese Electrical Society, MAG-91-161, Hoshino, et al., pp. 65-71.
Phys. Rev. Lett., vol. 61, p. 2472, 1988.

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