Magnetic multilayer film and magnetoresistance element

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

1996-03-12

1998-08-04

Resan, Steven A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428213, 428216, 428692, 428693, 428694R, 428900, 324252, 360110, 360113, 427130, 427131, 427548, G11B 566

Patent

active

057890692

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 of 0.01-0.5, an anisotropic magnetic field Hk of 1-20 Oe, and a thickness t.sub.1, a second magnetic thin film having a higher coercive force has a squareness ratio SQ.sub.2 of 0.7-1.0 and a thickness t.sub.2 .ltoreq.t.sub.1, and the non-magnetic thin film has a thickness t.sub.3 .ltoreq.200 .ANG.. A first preferred form requires 4 .ANG..ltoreq.t.sub.2 <30 .ANG. and 6 .ANG..ltoreq.t.sub.1 .ltoreq.200 .ANG.. A second preferred for requires 4 .ANG..ltoreq.t.sub.2 <20 .ANG. and 10 .ANG..ltoreq.t.sub.1 <20 .ANG.. A third preferred form requires 4 .ANG..ltoreq.t.sub.2 <30 .ANG. and 6 .ANG..ltoreq.t.sub.1 .ltoreq.40 .ANG.. The magnetic multilayer film has a great MR ratio of more than several percents in a low external magnetic field, a sharp rise at zero magnetic field and high heat resistance. It also has improved hysteresis and MR slope in an applied magnetic field between -10 Oe and +10 Oe. It additionally has a high MR slope of at least 0.15%/Oe in an applied magnetic field between -50 Oe and +50 Oe, improved hysteresis of MR ratio, and a high MR slope in a high-frequency magnetic field. There are obtained high sensitivity MR sensors and MR heads capable of high density magnetic recording.

REFERENCES:
patent: 5366815 (1994-11-01), Araki et al.
patent: 5510172 (1996-04-01), Araki et al.
patent: 5514452 (1996-05-01), Araki et al.

Affiliated with

Also associated with

Rating

Magnetic multilayer film and magnetoresistance element does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic multilayer film and magnetoresistance element, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic multilayer film and magnetoresistance element will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1175020