Spin Hall magnetoresistance effect from a disordered interface

TL;DR

This study reveals that interfacial disorder in Pt/MnPSe3 heterostructures can produce a SMR-like signal, challenging the assumption that SMR solely reflects magnetic interactions, and highlights the importance of interface quality in measurements.

Contribution

It demonstrates that disordered interfaces can generate SMR-like signals, emphasizing the need to consider interface quality in SMR-based magnetic characterization.

Findings

Disordered Pt/MnPSe3 interfaces produce a robust SMR-like signal.

TEM analysis shows formation of an amorphous platinum-chalcogen layer.

Interfacial disorder can obscure the magnetic origin of SMR signals.

Abstract

The Spin Hall magnetoresistance (SMR) emerged as a reference tool to investigate the magnetic properties of materials with an all-electrical set-up. Its sensitivity to the magnetization of thin films and surfaces may turn it into a valuable technique to characterize Van der Waals magnetic materials, which support long range magnetic order in atomically thin layers. However, realistic surfaces can be affected by defects and disorder, which may result in unexpected artifacts in the SMR, rather than the sole appearance of electrical noise. Here, we study the SMR response of heterostructures combining a platinum (Pt) thin film with the Van der Waals antiferromagnet MnPSe3 and observe a robust SMR-like signal, which turns out to originate from the presence of strong interfacial disorder in the system. We use transmission electron microscopy (TEM) to characterize the interface between MnPSe3 and Pt, revealing the formation of a few-nanometer-thick platinum-chalcogen amorphous layer. The analysis of the transport and TEM measurements suggests that the signal arises from a disordered magnetic system formed at the Pt/MnPSe3 interface, washing out the interaction between the spins of the Pt electrons and the MnPSe3 magnetic lattice. Our results show that damaged interfaces can yield an important contribution to SMR, questioning a widespread assumption on the role of disorder in such measurements.