Level splittings in exchange-biased spin tunneling

TL;DR

This paper investigates how exchange interactions influence energy level splittings in coupled single-molecule magnets, providing theoretical calculations that align with recent experimental observations.

Contribution

It introduces a perturbative method to calculate level splittings in antiferromagnetically coupled dimers with arbitrary spin, highlighting the role of exchange interactions.

Findings

Exchange interaction significantly affects level splittings.

Theoretical results agree with recent experimental data.

Perturbative approach applicable to arbitrary spin systems.

Abstract

The level splittings in a dimer with the antiferromagnetic coupling between two single-molecule magnets are calculated perturbatively for arbitrary spin. It is found that the exchange interaction between two single-molecule magnets plays an important role in the level splitting. The results are discussed in comparison with the recent experiment.