Stoner-Wohlfart model applied to bicrystal magnetoresistance hysteresis

TL;DR

This paper uses the Stoner-Wohlfarth model to numerically simulate magnetization and reproduce low-field magnetoresistance hysteresis in manganite bicrystal junctions, emphasizing the importance of biaxial anisotropy.

Contribution

It demonstrates that incorporating biaxial magnetocrystalline anisotropy is essential for accurately modeling magnetoresistance in bicrystal manganite junctions.

Findings

Reproduced hysteresis shapes using the Stoner-Wohlfarth model.

Showed the necessity of biaxial anisotropy for accurate description.

Validated the model against experimental observations.

Abstract

We calculate numerically the magnetization direction as function of magnetic field in the Stoner-Wohlfart theory and are able to reproduce the shape of the low-field magnetoresistance hysteresis observed in manganite grain boundary junctions. Moreover, we show that it is necessary to include biaxial magnetocrystalline anisotropy to fully describe the grain boundary magnetoresistance in La$_{0.7}$Sr$_{0.3}$MnO$_3$/SrTiO$_3$ bicrystal tunnel junctions.