Microscopic origin of the adiabatic change of magnetization in molecular magnets

TL;DR

This paper investigates the microscopic mechanisms behind the adiabatic change of magnetization in molecular magnets, focusing on the effects of Dzyaloshinskii-Moriya interaction and magnetic anisotropy in specific molecules.

Contribution

It provides a detailed microscopic model explaining how Dzyaloshinskii-Moriya interaction influences adiabatic magnetization changes in molecular magnets.

Findings

Energy-level repulsions depend strongly on magnetic field direction.

Dzyaloshinskii-Moriya interaction causes energy-level repulsions leading to magnetization changes.

Magnetic anisotropy plays a significant role in the magnetization behavior of Mn12-acetate.

Abstract

A microscopic model of the molecular magnet V15 is used to study mechanisms for the adiabatic change of the magnetization in time-dependent magnetic fields. Effects of the Dzyaloshinskii-Moriya interaction, the most plausible source for the energy-level repulsions that lead to adiabatic changes of the magnetization, are studied in detail. We find that the energy-level repulsions that result from this interaction exhibit a strong dependence on the direction of the applied field. We also discuss the role of magnetic anisotropy in the molecule Mn12 -acetate.