Kapitza pendulum effect in a weakly disordered amorphous magnet

TL;DR

This paper investigates how weak random anisotropy disorder affects magnetization orientation in amorphous magnets, revealing mechanisms that lift degeneracy and preserve long-range order.

Contribution

It identifies disorder types that lift degeneracy and suppress the Larkin-Imry-Ma mechanism in amorphous magnets.

Findings

Principal corrections to free energy stem from order parameter fluctuations.

Certain disorder types lift degeneracy and prevent long-range order disruption.

Disorder influences the stability of magnetization orientation.

Abstract

Effect of the "random anisotropy" type disorder on orientation of the magnetization in an amorphous magnet is considered. It is shown, that the principal corrections to the free energy of the magnet originate from the fluctuations of the order parameter in the direction of its degeneracy. The types of disorder are found, which lift the continuous degeneracy and suppress the Larkin-Imry-Ma mechanism of disruption of the long-range order in continuously degenerate systems.