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Abstract
We have used time-dependent magnetization measurements to probe the asymmetry in the magnetization-reversal mechanisms in exchange-biased ${\mathrm{MnF}}_{2}/\mathrm{F}\mathrm{e}$ bilayers. Analysis of the magnetic viscosity on the magnetizing and demagnetizing sides of the exchange-shifted hysteresis loops reveals a striking asymmetry. This is due to different mechanisms for reversal on the two sides of the loop as elucidated previously by polarized-neutron reflectometry and anisotropic-magnetoresistance measurements. The viscosity data reveal asymmetric features that are intrinsically related to the nature of the exchange anisotropy.
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