Effect of electric/magnetic field on pinned/biased moments at the interfaces of magnetic superlattices

TL;DR

This study investigates how electric and magnetic fields influence pinned and biased magnetic moments at the interfaces of ferromagnetic and antiferromagnetic superlattices, revealing field-dependent magnetoresistance effects.

Contribution

It demonstrates the control of biased/pinned moments at AFM/FM interfaces using electric and magnetic fields, providing new insights into interfacial coupling mechanisms.

Findings

Low field positive magnetoresistance observed

Biased/pinned moments can be oriented by magnetic and electric fields

Enhanced hysteretic magnetoresistance under out-of-plane magnetic field

Abstract

We have observed the pinned/biased moments in the superlattices consisting of ferromagnetic (FM) SrRuO3 (SRO) and antiferromagnetic (AFM) SrMnO3 (SMO)bilayer. The alternate stacking of SRO and SMO leading to a low field positive magnetoresistance with enhanced hysteretic field dependent magnetoresistance under the application of the out-of-plane magnetic field. We attribute these effects to the observed biased/pinned magnetic moments in the SRO layer in the vicinity of the interfaces. In addition, the biased/pinned moments can be oriented under the application of either the out-of-plane magnetic field or a combination of out-of-plane magnetic field and in-plane electric field. These results will bring new insights in the understanding of the coupling at the AFM/FM interface which can be useful for creating new exotic phenomena at the interfaces of the multilayer.