Modeling thermal effects in Heisenberg dimers initiated by fast magnetic field switching off

Abstract

In this article, we analyze the thermal processes induced in the Heisenberg-type exchange coupled binuclear clusters by suddenly switching off the magnetic field initially applied to the system. The key result of the present study is the established correlation between the sign of the exchange parameter and the sign of the thermal effect. We have demonstrated that in the case of a ferromagnetic exchange, heat absorption (cooling) occurs, while if the exchange is antiferromagnetic, heat release (heating) takes place. This conclusion suggests a possibility to regard Heisenberg type dimers exhibiting ferromagnetic exchange as a class of low-temperature magnetic refrigerants that could be promising for practical applications.