Temperature dependence of magnetisation and paramagnetism of ferromagnetic-antiferromagnetic superlattices

Using the mean-field approximation, the spontaneous magnetisation and paramagnetic susceptibility of localised spin ferromagnetic-superlattices, in which the antiferromagnetic films possess an odd number of the atomic planes which are parallel to the interfaces of the superlattices, are calculated numerically. A study of the spontaneous magnetisation as a function of temperature shows that the superlattices display five kinds of magnetism, and the compensation point appears for some values of the parameters J ab , J a and J b . The calculation for the paramagnetic susceptibility shows that this system displays a paramagnetism that is similar to ferromagnetic, antiferromagnetic or ferromagnetic paramagnetism, depending upon J ab , J a , J b and the period of the system.