The Anatomy of Plastic Events in Magnetic Amorphous Solids

TL;DR

This paper investigates the complex plastic events in magnetic amorphous solids, revealing how mechanical and magnetic interactions produce diverse, non-universal serrated noise patterns that depend on system state and microscopic details.

Contribution

It provides a detailed analysis of the anatomy of plastic events in magnetic amorphous solids, highlighting the non-universality and complexity of their statistical properties.

Findings

Plastic events in magnetic amorphous solids involve complex contributions.

The statistics of serrated noises depend on system state and microscopic interactions.

Theoretical explanations account for observed noise statistics.

Abstract

Plastic events in amorphous solids can be much more than just "shear transformation zones" when the positional degrees of freedom are coupled non-trivially to other degrees of freedom. Here we consider magnetic amorphous solids where mechanical and magnetic degrees of freedom interact, leading to rather complex plastic events whose nature must be disentangled. In this paper we uncover the anatomy of the various contributions to some typical plastic events. These plastic events are seen as Barkhausen Noise or other "serrated noises". Using theoretical considerations we explain the observed statistics of the various contributions to the considered plastic events. The richness of contributions and their different characteristics imply that in general the statistics of these "serrated noises" cannot be universal, but rather highly dependent on the state of the system and on its microscopic interactions.