High thermal stability of exchange-biased bilayers and bottom giant magnetoresistive spin valves using an α-Fe[sub 2]O[sub 3] antiferromagnetic layer

Bae, Seongtae; Judy, Jack H.; Chen, P. J.; Egelhoff, William F.; Zurn, Shayne
June 2001
Applied Physics Letters;6/25/2001, Vol. 78 Issue 26, p4163
Academic Journal
The thermal stability of antiferromagnetic α-Fe[sub 2]O[sub 3] exchange-biased bilayers and bottom giant magnetoresistive (GMR) spin valves has been investigated experimentally at various ambient temperatures. An α-Fe[sub 2]O[sub 3] exchange-biased bilayer exhibited a high blocking temperature, T[sub b], of 390 °C, and a bottom spin valve showed stable GMR performance above 350 °C. The T[sub b] of α-Fe[sub 2]O[sub 3] 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-Fe[sub 2]O[sub 3] increased T[sub b] by up to 23%. © 2001 American Institute of Physics.


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