Back to Search Start Over

Impact of trace amounts of interfacial oxidation on the spin–orbit torque in the Co/Pt heterostructures

Authors :
Desheng Xue
Jiguang Yao
Yongwei Cui
Peng Zhang
Li Xi
Xiaolong Fan
Xiaoyu Feng
Qiaoning Bai
Jiangwei Cao
Source :
Applied Physics Letters. 118:132410
Publication Year :
2021
Publisher :
AIP Publishing, 2021.

Abstract

We found that the exposure of a Co/Pt bilayer to air will result in a trace amount of oxidation at the Co/Pt interface, while the Pt layer is immune to oxidation. The appearance of CoOx results in a negative spin Hall magnetoresistance and unconventional spin–orbit torques (SOTs), which are observed through temperature-dependent transport and spin-torque ferromagnetic resonance measurements. These results can be understood by considering CoOx as an individual magnetic layer between Pt and Co, with two important characteristics: (1) its magnetization is aligned in the plane that is perpendicular to the magnetization of Co and (2) the spin transparency of CoOx increases with increasing temperature. These results help us understand the features of spin transport at the interface when oxidation occurs and further indicate that trace amounts of oxidation can be a highly effective method to control SOT in magnetic heterostructures.

Details

ISSN :
10773118 and 00036951
Volume :
118
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........58d59465633a42cb461f2f630a91a95c