Anisotropic pinned/biased magnetization in $SrRuO_3/SrMnO_3$ superlattices

TL;DR

This study investigates the anisotropic exchange coupling and magnetization pinning effects at the interfaces of SrRuO3/SrMnO3 superlattices, revealing irreversible spin rotation and biasing phenomena influenced by magnetic field orientation.

Contribution

It provides new insights into interface-induced anisotropic magnetization behavior in ferromagnetic/antiferromagnetic superlattices.

Findings

In-plane field cooling reduces magnetization compared to zero-field cooling.

Out-of-plane field cooling causes hysteresis loop shifts indicating bias.

Irreversible spin rotation is observed near interfaces due to pinning.

Abstract

The exchange coupling at the interfaces of magnetic superlattices consisting of ferromagnetic $SrRuO_3$ and antiferromagnetic $SrMnO_3$ grown on (001) oriented $SrTiO_3$ is studied with in-plane and out-of-plane orientations, with respect to the substrate plane, of the cooling magnetic field. The magnetization of the in-plane, field cooled hysteresis loop is lower than the corresponding in-plane zero-field-cooled hysteresis loop. The out-of-plane field cooled hysteresis loop is shifted, from the origin, along the graphical magnetization axis. We attribute this irreversible rotation of the moment to the pinning/biasing of spin in the $SrRuO_3$ layer in the vicinity of interfaces by the antiferromagnetic $SrMnO_3$ layer.