Renormalization of the tunnel splitting in a rotating nanomagnet

Authors

Michael F. O'Keeffe, CUNY Lehman College
Eugene M. Chudnovsky, CUNY Lehman CollegeFollow

Document Type

Article

Publication Date

2011

Abstract

We study spin tunneling in a magnetic nanoparticle with biaxial anisotropy that is free to rotate about its anisotropy axis. Exact instanton of the coupled equations of motion is found that connects degenerate classical energy minima. We show that mechanical freedom of the particle renormalizes magnetic anisotropy and increases the tunnel splitting.

Comments

This work was originally published in Physical Review B - Condensed Matter and Materials Physics, available at DOI: 10.1103/PhysRevB.83.092402