The origin of noncollinear anisotropies and asymmetric magnetization reversal in FM/AFM bilayer system

► Effects on the emergence of noncollinear anisotropies is investigated. ► Diagram of noncollinear anisotropies and negative (positive) exchange bias is given. ► Relation between unidirectional anisotropy and antiferromagnet magnetization is given. ► Magnetization reversal asymmetry caused by unidirectional anisotropy is discussed.