“Villari reversal” in the exchange biased [Pd/Co]5/FeMn thin films with perpendicular anisotropy

Jeun, Minhong; Lin Lin; Ho Wan Joo; Seongtae Bae; Jang Heo; Ky Am Lee
April 2009
Applied Physics Letters;4/13/2009, Vol. 94 Issue 15, p152512
Academic Journal
Exchange bias characteristics of [Pd/Co]5/FeMn thin films with perpendicular anisotropy have been explored by externally applying a mechanical stress for a magnetic pressure sensor application. It was found that the physical behavior of exchange bias field and coercivity of the [Pd/Co]5/FeMn thin films are closely relevant to the strength of applied stress and its direction. Magnetoelastic energy calculation and the physical analysis demonstrated that the stress-induced “Villari reversal” of the Co magnetizations directly resulted in changing the perpendicular anisotropy of the [Co/Pd] multilayers is primarily responsible for the variation in exchange bias coupling occurred at the [Co/Pd] and FeMn interface.


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