Fig. 1: Manipulation of the exchange coupling in an uncompensated antiferromagnet.
From: Intrinsic exchange biased anomalous Hall effect in an uncompensated antiferromagnet MnBi2Te4
a Schematic of the atomic structure for a 7SL MBT AFM with the nearest neighbor exchange coupling is denoted in the figure. b Micromagnetic simulation for the coercive field, HC, as a function of the exchange coupling ratio, J1/J, for the MBT. The inset in b is the simulated magnetization versus magnetic field at different exchange coupling ratios. Schematic of energy landscapes and trajectory of the spin states in 7SL MBT when evolving from negative to positive field for c comparable exchange coupling (J1 ~ J), and d weak coupling of the first layer to the total exchange coupling (J1 << J). The x-axis represents the spin angles in layer 1, while the y-axis represents the spin angles in layers 2–7 of the 7SL MBT.
