Abstract
A hard axis hysteresis loop shift from the origin has been observed in the exchange biased $\mathrm{Mn}\mathrm{Pt}∕\mathrm{Ni}\mathrm{Fe}$. A model that accounts for the hard axis hysteresis loop shift is proposed. For the correct description of the experimental results, a misalignment between the easy axis of ferromagnetic and antiferromagnetic films in the exchange biased $\mathrm{Mn}\mathrm{Pt}∕\mathrm{Ni}\mathrm{Fe}$ bilayers has to be taken into account. An experimental method to measure the misalignment in noncollinear exchange biased systems is developed. The method is based on the measurements of hard axis hysteresis loops at angles $\ensuremath{\pi}∕2$ and $(\ensuremath{-}\ensuremath{\pi}∕2)$ with respect to the easy axis of ferromagnetic film. A study of the misalignment as a function of antiferromagnetic layer thickness is carried out. Our approach is generalized for complex systems with high-order anisotropies.
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