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(Color online) Hysteresis loops of the sample with in-plane easy axes along the  and  crystallographic directions. The applied in-plane magnetic field makes an angle with the  direction. (a) The major hysteresis loop addresses all four possible magnetization states: . (b) Minor hysteresis loops address only two states: lower or upper . (c) Experimental major hysteresis loop measured via the linear magnetic dichroism. The vertical arrows indicate the magnetic fields where switching from magnetization state to state occurs. Solid and open symbols correspond to up-sweep and down-sweep of the hysteresis loops. (d) Experimental lower minor hysteresis loop measured via the linear magnetic dichroism. (e) Schematic behavior of the magnetic birefringence signal accompanying a switch from state 2 to state 3 in a constant magnetic field at low temperature (bottom panel), when reducing the coercivity through a laser heat pulse (middle panel), and when returning to low temperature (top panel).
(Color online) Minor hysteresis loops of the sample, recorded before (open symbols) and after (solid symbols) single optical pulse with a duration of , are shown together with corresponding magnetization orientations (insets).
Polarization rotation of the linear magnetic dichroism of our sample after excitation with a single optical pulse, plotted (a) versus magnetic field at fixed pump fluence , and (b) versus pump fluence at a fixed magnetic field . A polarization rotation of about corresponds to a switching event, and is indicated by the gray areas. Note, in panel (a), when , a switching event already occurs without optical pulse assistance [see Fig. 1(c)].
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