Abstract
Abstract The influence of noncollinearity between unidirectional and uniaxial anisotropies on asymmetric magnetization reversal of NiFe/IrMn bilayers has been investigated. The experimental findings show that a noncollinear effective anisotropies originates from the competition among the applied magnetic field, magnetic anisotropy and exchange coupling, and the presence of magnetic frustration at NiFe/IrMn interfaces. Azimuthal measurements of the exchange bias suggest that the degree of effective interfacial anisotropies, which can be quantified by the angle ( γ ) between the uniaxial and unidirectional anisotropies, plays a crucial role in determining magnetization reversal. For a variable thickness of antiferromagnet layers, the experimental findings suggest a non-monotonic correlation between the magnitude of γ and the degree of interfacial roughness. Numerical analysis has been performed by considering the magnetic frustration present at the ferromagnet/antiferromagnet interfaces, suggesting a good agreement with experimental findings.
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