Rotational magnetocaloric effect of anisotropic giant spin systems

TL;DR

This paper investigates the anisotropic rotational magnetocaloric effect in single molecule magnets Fe8 and Mn12, analyzing both equilibrium and non-equilibrium thermodynamic behaviors under magnetic field rotation.

Contribution

It provides a theoretical analysis of the rotational magnetocaloric effect in anisotropic giant spin systems, including non-equilibrium thermodynamic cycle effects.

Findings

Identification of the rotational magnetocaloric effect in Fe8 and Mn12

Analysis of equilibrium and non-equilibrium thermodynamic cycles

Insights into temperature changes due to magnetic field direction variation

Abstract

The magnetocaloric effect, that consists of adiabatic temperature changes in a varying external magnetic field, appears not only when the amplitude is changed, but in cases of anisotropic magnetic materials also when the direction is varied. In this article we investigate the magnetocaloric effect theoretically for the archetypical single molecule magnets Fe8 and Mn12 that are rotated with respect to a magnetic field. We complement our calculations for equilibrium situations with investigations of the influence of non-equilibrium thermodynamic cycles.