NDLI: Reduction of AMR effect in giant magnetoresistance spin valve structures

Content Provider	IEEE Xplore Digital Library
Author	Li, M. Liao, S.-H. Horng, C. Zheng, Y. Tong, R.Y. Ju, K. Dieny, B.
Copyright Year	1965
Abstract	For spin valve heads, the conventional anisotropic magnetoresistance (AMR) effect deteriorates the linearity of transfer curves and degrades its performance. This problem is more severe for thicker free layer spin valve. In this paper, giant magnetoresistance (GMR) and AMR effect of a spin valve structure with laminated free layer (seed/Fa/I/Fb/Cu/AP1/Ru/AP2/AFM/cap, I is a thin high resistive layer) were calculated using semiclassical transport model. It is found that the GMR of spin valve structure with laminated free layer is reduced slightly and DR is comparable with the standard one due to the increase of the sheet resistance. The AMR of the laminated free layer reduced dramatically due to the effective magnetic thickness reduction. Therefore, the AMR/GMR ratio in spin valve was greatly reduced. Film level experimental data confirmed the simulation results. As an example, the AMR of 80 /spl Aring/, 65 /spl Aring/ thickness free layer reduced from 1.6, 1.2% to 0.74, 0.6%, respectively, while GMR ratio reduced slightly due to lamination of free layer. The AMR effect of spin valve structure can be reduced by 50% through the lamination of the free layer. It can be expected that the linearity of the transfer curves can be improved greatly.
Sponsorship	IEEE Magnetics Society
Starting Page	1733
Ending Page	1735
Page Count	3
File Size	82857
File Format	PDF
ISSN	00189464
Volume Number	37
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Anisotropic magnetoresistance Giant magnetoresistance Spin valves Linearity Lamination Magnetic heads Degradation Magnetic anisotropy Perpendicular magnetic anisotropy Magnetic films
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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