Reversal-field memory in magnetic hysteresis

TL;DR

This paper investigates the reversal-field memory effect in magnetic hysteresis, revealing a singularity linked to local spin-reversal symmetry, and distinguishes between different spin glass models based on this phenomenon.

Contribution

It demonstrates the existence of a reversal-field memory effect in magnetic hysteresis and connects it to microscopic spin-reversal symmetry, providing a new way to differentiate spin glass models.

Findings

Reversal-field memory causes a nonanalyticity in magnetization curves.

The effect is linked to local spin-reversal symmetry of the Hamiltonian.

Presence or absence of the effect distinguishes different spin glass models.

Abstract

We report results demonstrating a singularity in the hysteresis of magnetic materials, the reversal-field memory effect. This effect creates a nonanalyticity in the magnetization curves at a particular point related to the history of the sample. The microscopic origin of the effect is associated with a local spin-reversal symmetry of the underlying Hamiltonian. We show that the presence or absence of reversal-field memory distinguishes two widely studied models of spin glasses (random magnets).