Many-Spin Interactions and Spin Excitations in Mn12

TL;DR

This paper investigates many-spin interactions in Mn12 clusters using an 8-spin model, explaining experimental magnetic data and emphasizing the importance of Dzyaloshinsky-Moriya interactions for neutron scattering and magnetization relaxation.

Contribution

It introduces a detailed 8-spin model for Mn12 clusters and determines parameters that explain experimental magnetic and neutron scattering data.

Findings

Many-spin excitations explain neutron scattering peaks.

Dzyaloshinsky-Moriya interactions are crucial for data description.

Model accounts for temperature dependence of magnetic susceptibility.

Abstract

In this work, the many-spin interactions taking place in Mn12 large-spin clusters are extensively studied using the 8-spin model Hamiltonian, for which we determine the possible parameters based on experimental data. Account of the many-spin excitations satisfactorily explains positions of the neutron scattering peaks, results of EPR measurements and the temperature dependence of magnetic susceptibility. In particular, strong Dzyaloshinsky-Morya interactions are found to be important for description of neutron scattering data. The role of these interactions for the relaxation of the magnetization is qualitatively discussed.