Quantum Stoner-Wohlfarth model of two-dimensional single domain magnets

TL;DR

This paper extends the classical Stoner-Wohlfarth model to two-dimensional magnets at finite temperature, revealing unique hysteresis behaviors and temperature-dependent magnetization switching properties relevant for 2D spintronics.

Contribution

It introduces a modified SW model for 2D magnets incorporating spin fluctuations, predicting distinct hysteresis features and temperature effects not present in 3D models.

Findings

Hysteresis properties differ significantly between 2D and 3D magnets.

The magnetization switching diagram becomes temperature-dependent and asymmetric.

New insights for 2D magnetic materials in spintronics applications.

Abstract

The Stoner-Wohlfarth (SW) model is a classical model for magnetic hysteresis of single-domain particles. For two-dimensional magnets at finite temperature, the SW model must be extended to include intrinsic strong spin fluctuations. We predict several fundamentally different hysteresis properties between 2D and 3D magnets. The magnetization switching diagram known as the Asteroid figure in the conventional SW model becomes highly temperature dependent and asymmetric with respect to the transverse and longitudinal magnetic fields. Our results provide new insights for 2D magnetic materials based spintronics applications.