NDLI: Spin-valve heads with self-stabilized free layer by antiferromagnet

Content Provider	IEEE Xplore Digital Library
Author	Sining Mao Zheng Gao Haiwen Xi Kolbo, P. Plumer, M. Lei Wang Goyal, A. Insik Jin Jian Chen Chunhong Hou White, R.M. Murdock, E.
Copyright Year	1965
Abstract	We demonstrate the feasibility of a spin-valve read head using an adjacent antiferromagnetic (AFM) layer to provide a stabilization Held, eliminating the hard bias permanent magnet layer. The head stack consists of seed/AFM/CoFe/Ru/CoFe/Cu/CoFe (and/or NiFe)/Cu/IrMn/cap where the AFM is PtMn or IrMn. The abutted junction is about 0.1 /spl mu/m wide at the free layer and no permanent magnet materials are used. Micromagnetic modeling indicates that a proper bias field is needed to have a stable head response. The bias field from the AFM layer can be modified by a nonmagnetic spacer layer between AFM and FM. The coupling field decays exponentially with the thickness of the spacer layer, consistent with a pinhole-dominated mechanism. Unshielded sensors show much higher sensitivity as,compared with a standard PM abutted junction head. Microtrack profile based on the spin-stand test shows a regular shape without apparent lumps. The electrical reader width is about 6 /spl mu/" (0.15 /spl mu/m), corresponding to a track density of 112 ktpi. Combined with a linear density of 591 kbpi the heads in this work are capable of areal density around 66 Gb/in/sup 2/.
Sponsorship	IEEE Magnetics Society
Starting Page	26
Ending Page	31
Page Count	6
File Size	343041
File Format	PDF
ISSN	00189464
Volume Number	38
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Antiferromagnetic materials Magnetic heads Permanent magnets Testing Magnetic materials Micromagnetics Shape Magnetic memory Magnetoresistance
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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