Question

Can we have magnetic hysteresis in paramagnetic or diamagnetic substances?

Answer 1

No, magnetic hysteresis is the lagging of intensity of magnetization (I) behind magnetising force (H). When diamagnetic and paramagnetic materials are placed in a magnetic field they get weekly magnetised. Also, they lose their magnetization as the magnetic field is removed (low retentively). Therefore, they do not form magnetic hysteresis curve.