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Unidirectional Magnetization Relaxation in Exchange-Biased Films

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8 Author(s)
Mewes, T. ; Dept. of Phys. & Astron., Univ. of Alabama, Tuscaloosa, AL, USA ; Stamps, R.L. ; Lee, H. ; Edwards, E.
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The magnetization relaxation of thin ferromagnetic Ni81Fe19 films in close proximity and in direct contact with antiferromagnetic FeMn films was investigated using broadband ferromagnetic resonance. For unbiased films, a contribution to the effective-damping parameter αeff inversely proportional to the ferromagnetic film thickness is found, consistent with the presence of spin pumping. For biased films, we find a unidirectional contribution to the effective-damping parameter, which does not scale with the inverse film thickness. The unidirectional character of the magnetization relaxation is described in terms of two-magnon scattering.

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Magnetics Letters, IEEE  (Volume:1 )

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