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High thermal stability of exchange-biased bilayers and bottom giant magnetoresistive spin valves using an α-Fe2O3 antiferromagnetic layer

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5 Author(s)
Bae, Seongtae ; The Center for Micromagnetics and Information Technologies (MINT), Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455 ; Judy, J.H. ; Chen, P.J. ; Egelhoff, W.F.
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The thermal stability of antiferromagnetic α-Fe2O3 exchange-biased bilayers and bottom giant magnetoresistive (GMR) spin valves has been investigated experimentally at various ambient temperatures. An α-Fe2O3 exchange-biased bilayer exhibited a high blocking temperature, Tb, of 390 °C, and a bottom spin valve showed stable GMR performance above 350 °C. The Tb of α-Fe2O3 exchange-biased bilayers depended strongly on the adjacent ferromagnetic material and the number of measurements. In addition, the increasing mean grain size and enhanced (104) and (110) crystalline texture of α-Fe2O3 increased Tb by up to 23%. © 2001 American Institute of Physics.

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Applied Physics Letters  (Volume:78 ,  Issue: 26 )