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Influence of rare earth metal Ho on interfacial Dzyaloshinskii-Moriya interaction and spin torque efficiency in Pt/Co/Ho multilayers

Abstract

Owing to the large spin-orbit coupling and tunable magnetization, heavy rare-earth metals Gd and Tb have great effects on the enhancement of spin-orbit torque (SOT) and fast domain wall (DW) motion. But the reports of heavy rare-earth metal Ho with more 4f electrons in the research of spintronics are limited. In this work, we found that the interfacial Dzyaloshinskii-Moriya interaction (DMI) and SOT in Pt/Co/Ho multilayers can be strongly influenced by changing the thickness of Ho (tHo) layer. At tHo = 2.4 nm, DMI exchange constant |D| and spin torque efficiency ξ_DL reach to the maximum values of 1.24 mJ/m2 and 0.137 respectively, which are comparable with that in other Pt/Co/nonmagnetic (NM) layer structures. The deterministic current-induced magnetization switching with low critical current density of 〖10〗^6 A/〖cm〗^2 can be realized when tHo is less than 5 nm. The Néel-type DW with left-handed chirality and positive sign D can be determined by observing the current-induced asymmetric DW motion. Our results are helpful to prompt the application of heavy rare-earth elements in the fields of DMI, SOT and chiral DW dynamics.

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Article information


Submitted
17 Mar 2020
Accepted
09 May 2020
First published
11 May 2020

Nanoscale, 2020, Accepted Manuscript
Article type
Paper

Influence of rare earth metal Ho on interfacial Dzyaloshinskii-Moriya interaction and spin torque efficiency in Pt/Co/Ho multilayers

L. Liu, X. Zhao, W. Liu, Y. Song, X. Zhao and Z. Zhang, Nanoscale, 2020, Accepted Manuscript , DOI: 10.1039/D0NR02168G

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