Fig. 1
Magnetic properties of ferrimagnetic bilayer. a Temperature-dependent coercivity of Gd loops. b Temperature-dependent magnetic moments of Co and Gd. Co and Gd magnetic moments are normalized to their respective values at the transition temperature of 207.5 K. Error bar of the magnetic moments are estimated from the noise and non-linear background of the XMCD spectrum. c Threshold field Hth at which the DWs start to move as a function of T (from Kerr microscopy). Red and blue dots indicate expansion of the up and down domains in the Co layer, respectively. Direction of DW motion is depicted in the inset in which the Co sublayer magnetization is shown. Dashed lines represent fit to the data by a hyperbola. d Schematic illustration of the DW configuration in the Co and Gd layers at T < TM, T = TM, T = TA and T > TA. mGd increases with decreasing T and compensates mCo at TM
