Spin valves with enhanced GMR and thermal stability

Details Spin valves with enhanced GMR and thermal stability Spin valves with enhanced GMR and thermal stability

1997-12-05

2000-10-31

Letscher, George J.

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

G11B 539

Patent

active

061411914

ABSTRACT:
An SV sensor with the preferred structure Substrate/Seed/Free/Spacer/Pinned/AFM/Cap where the seed layer is a non-magnetic Ni--Fe--Cr or Ni--Cr film and the AFM layer is preferably Ni--Mn. The non-magnetic Ni--Fe--Cr seed layer results in improved grain structure in the deposited layers enhancing the GMR coefficients and the thermal stability of the SV sensors. The improved thermal stability enables use of Ni--Mn with its high blocking temperature and strong pinning field as the AFM layer material without SV sensor performance degradation from the high temperature anneal step needed to develop the desired exchange coupling.

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patent: 5637235 (1997-06-01), Kim et al.
patent: 5666248 (1997-09-01), Gill
patent: 5731936 (1998-03-01), Lee et al.
patent: 5850323 (1998-12-01), Kanai

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