Fig. 4: Schematic of the origin of the orthogonal interlayer coupling.
From: Orthogonal interlayer coupling in an all-antiferromagnetic junction
The magnetic order of Cr2O3 in parallel-preferred and antiparallel-preferred areas in the collinear state (a) and orthogonal state (b). The right insets are equivalent magnetic structure in Cr2O3. In collinear state, the 180° domain wall is induced over the Cr2O3 thickness t. But in the orthogonal state, the two 90° domain walls equal to a 180° domain wall over 2t, leading to a lower energy as compared with the collinear state and the stabilization of orthogonal state. Note that the real energy of the two states are more complicated due to the relaxation of the Fe2O3 layers. ACr is the exchange stiffness of Cr2O3. The gray lines are guidelines for magnetic moment rotation.
