Critical temperatures and the compensation temperatures of disordered and amorphous ferrimagnetic Ising systems

The concentration dependences of the transition temperature and compensation temperature in a disordered binary ferrimagnetic alloy and its amorphization are investigated by the use of effective-field theory with correlations. For the amorphization process, a number of interesting phenomena, such as the possibility of the reentrant ferrimagnetic phase, are obtained which arise from the random distribution of exchange bonds in sign. While new amorphous ferrimagnetic alloys may reveal other new phenomena, at the present time the main interest of experimentalists is directed towards obtaining an amorphous ferrimagnetic alloy which has a compensation point in the vicinity of room temperature, because of its potential device applications.