Origin of magnetic anisotropy in $La_{(1\-x)}Sr_{x}MnO_{3}$

TL;DR

This paper investigates the origin of magnetic anisotropy in Sr-doped LaMnO3 manganites, attributing it to exchange interactions at boundaries between ferromagnetic and antiferromagnetic regions, which vary with doping levels.

Contribution

It proposes a new explanation for magnetic anisotropy based on boundary interactions between magnetic domains in doped manganites.

Findings

Magnetic anisotropy causes differences in magnetization temperature dependence.

Exchange interactions at domain boundaries lead to nonmonotonic doping behavior.

Boundary effects are key to understanding magnetic anisotropy in these materials.

Abstract

Here, we report the origin of magnetic anisotropy in Sr-doped infinite layer manganites $La_{(1\-x)}Sr_{x}MnO_{3}$ (0.125 \leq x \leq 0.400). Magnetic anisotropy is responsible for the large difference in the temperature dependence of field-cooled and zero-field-cooled magnetization. Translational symmetry breaking in the context of spins around the boundary between the ferromagnetic (FM) antiferromagnetic (AFM) region leads to FM-AFM interaction and results in magnetic anisotropy (exchange anisotropy). Here, we propose that FM-AFM interaction around the boundary between FM clusters or domains in the AFM background or between AFM clusters or domains in the ferromagnetic background is responsible for doping-dependent nonmonotonic behavior and the origin of magnetic anisotropy.