Paramagnetic
Paramagneticity has a magnetic property when an external magnetic field is present, but loses its magnetic property once the external magnetic field disappears. This is a different phenomenon from the ferromagnetism in which the magnetic field remains even if the magnetic field disappears again. That is, the paramagnetic material has a relative magnetic permeability greater than 1 and a positive magnetic susceptibility. Since the magnetic dipoles in the material are temporarily relocated by the external magnetic field, the injury force is linear when the strength of the field is weak. It typically requires a sensitive analytical balance to detect effects. Unlike ferromagnetism, paramagneticity has no magnetic field in the absence of an externally applied magnetic field. This is because the thermal motion causes the spin to be randomly oriented when there is no external magnetic field. The total magnetic field thus drops to zero when the applied magnetic field is removed. Even if there is a magnetic field, only a small magnetization occurs because only a few of the total particles are aligned by the magnetic field.