NDLI: Exchange-coupled Ni-Fe/Fe-Mn, Ni-Fe/Ni-Mn and NiO/Ni-Fe films for stabilization of magnetoresistive sensors

Content Provider	IEEE Xplore Digital Library
Author	Tsan Lin Ching Tsang Fontana, R.E. Howard, J.K.
Copyright Year	1965
Abstract	We have studied the unidirectional anisotropy field (H/sub UA/) and coercivity (H/sub CE/) in exchange-coupled Ni-Fe/Fe-Mn, Ni-Fe/Ni-Mn and NiO/Ni-Fe films as functions of thickness and temperature, and evaluated these films for the stabilization of magnetoresistive (MR) sensors. The as-deposited Ni-Fe/Fe-Mn and NiO/Ni-Fe films exhibit strong exchange coupling, while the Ni-Fe/Ni-Mn films require annealing to enhance exchange coupling. Both H/sub UA/ and H/sub CE/ follow an inverse dependence of the Ni-Fe film thickness in all cases, as expected from the interface nature of exchange coupling. The Fe-Mn film thickness required for the onset of exchange coupling is much smaller than the Ni-Mn and NiO film thicknesses. The thermal stability of the Ni-Fe/Ni-Mn films is superior to that of the Ni-Fe/Fe-Mn and NiO/Ni-Fe films. To explain annealing effects on exchange coupling in the Ni-Fe/Ni-Mn films, we propose an exchange-coupling model consistent with models applied to the Ni-Fe/Fe-Mn and NiO/Ni-Fe films in previous studies. Uniform-field tests of the MR sensors longitudinally biased by the three types of exchange-coupled films show quiet and stable MR responses in all cases. We evaluate the exchange-coupled films based on desired properties for the sensor stabilization, and then discuss their merits and deficiencies.
Sponsorship	IEEE Magnetics Society
Starting Page	2585
Ending Page	2590
Page Count	6
File Size	758177
File Format	PDF
ISSN	00189464
Volume Number	31
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetoresistance Temperature sensors Magnetic sensors Antiferromagnetic materials Magnetic films Annealing Sensor systems Thick film sensors Coercive force Magnetic anisotropy
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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