Macrospin Tunneling and Magnetopolaritons with Nanomechanical Interference

TL;DR

This paper theoretically investigates how nanomechanical interference suppresses quantum tunneling in a magnetic nanoparticle coupled to a resonator, predicting observable effects in molecular magnet experiments.

Contribution

It introduces a theoretical framework combining instanton and perturbative methods to analyze macrospin tunneling and magnetopolaritons affected by nanomechanical interference.

Findings

Suppression of magnetization tunneling due to nanomechanical interference.

Destruction of magnetopolaritons by interference effects.

Experimental verification possible with molecular magnets on nanomechanical bridges.

Abstract

We theoretically address the quantum dynamics of a nanomechanical resonator coupled to the macrospin of a magnetic nanoparticle by both instanton and perturbative approaches. We demonstrate suppression of the tunneling between opposite magnetizations by nanomechanical interference. By approximating the macrospin as a two-level system, we describe magnetopolaritons and their destruction by interference. The predictions can be verified experimentally by a molecular magnet attached to a nanomechanical bridge.