Why antiferromagnetic material shows hysteresis on RMCD too?

15 December 2019 0 9K Report

The above red graph shows ferromagnetism of CrI3 and below shows antiferromagnetism of CrI3. From (Nature Materials | VOL 1298 18 )

I know why hysteresis graph shows up in FM on H~0, but why AFM shows some double hysteresis on each side? This is A-type antiferromagnetic bilayer which means intralyer is Fm but interlayer is AFM. Is it due to the spin flipping time of each layer being different?

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