Harnessing Orbital-to-Spin Conversion of Interfacial Orbital Currents for Efficient Spin-Orbit Torques

Autoren

Shilei Ding
Andrew Ross
Dongwook Go
Lorenzo Baldrati
Zengyao Ren
Frank Freimuth
Sven Becker
Fabian Kammerbauer
Jinbo Yang
Gerhard Jakob
Yuriy Mokrousov
Mathias Kläui

DOI

10.1103/physrevlett.125.177201

eISSN

1079-7114

ISSN

0031-9007

Ausgabe der Veröffentlichung

17

Zeitschrift

Physical Review Letters

Sprache

en

Artikelnummer

177201

Online publication date

2020

Status

Published online

Herausgeber

American Physical Society (APS)

Herausgeber URL

http://dx.doi.org/10.1103/physrevlett.125.177201

Datum der Datenerfassung

2020

Titel

Harnessing Orbital-to-Spin Conversion of Interfacial Orbital Currents for Efficient Spin-Orbit Torques

Ausgabe der Zeitschrift

125

Datenquelle: Crossref

Abstract

Current-induced spin-orbit torques (SOTs) allow for the efficient electrical manipulation of magnetism in spintronic devices. Engineering the SOT efficiency is a key goal that is pursued by maximizing the active interfacial spin accumulation or modulating the nonequilibrium spin density that builds up through the spin Hall and inverse spin galvanic effects. Regardless of the origin, the fundamental requirement for the generation of the current-induced torques is a net spin accumulation. We report on the large enhancement of the SOT efficiency in thulium iron garnet (TmIG)/Pt by capping with a CuO_{x} layer. Considering the weak spin-orbit coupling (SOC) of CuO_{x}, these surprising findings likely result from an orbital current generated at the interface between CuO_{x} and Pt, which is injected into the Pt layer and converted into a spin current by strong SOC. The converted spin current decays across the Pt layer and exerts a "nonlocal" torque on TmIG. This additional torque leads to a maximum colossal enhancement of the SOT efficiency of a factor 16 for 1.5 nm of Pt at room temperature, thus opening a path to increase torques while at the same time offering insights into the underlying physics of orbital transport, which has so far been elusive.

Addresses

State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China.

Autoren

Shilei Ding
Andrew Ross
Dongwook Go
Lorenzo Baldrati
Zengyao Ren
Frank Freimuth
Sven Becker
Fabian Kammerbauer
Jinbo Yang
Gerhard Jakob
Yuriy Mokrousov
Mathias Kläui

DOI

10.1103/physrevlett.125.177201

eISSN

1079-7114

Externe Identifier

PubMed Identifier: 33156648

Funding acknowledgements

National Natural Science Foundation of China: 51731001
Exploratory Research for Advanced Technology: JPMJER1402
Johannes Gutenberg-Universität Mainz:
National Key Research and Development Program of China: 2016YFB0700901
Norges Forskningsråd: 262633
National Key Research and Development Program of China: 2017YFA0403701
MaHoJeRo:
National Key Research and Development Program of China: 2017YFA0206303
Deutsche Forschungsgemeinschaft: 358671374
H2020 Marie Skłodowska-Curie Actions: 793159
Graduate School of Excellence Materials Science In Mainz: DFG 266
National Natural Science Foundation of China: 11805006
Deutsche Forschungsgemeinschaft: A11
National Natural Science Foundation of China: 11975035
Deutsche Forschungsgemeinschaft: 268565370
Deutscher Akademischer Austauschdienst: 57334897
Deutscher Akademischer Austauschdienst: 57524834
Horizon 2020 Framework Programme:
Max Planck Graduate Center:
National Natural Science Foundation of China: 11675006
Deutsche Forschungsgemeinschaft: A01
Deutsche Forschungsgemeinschaft: B02

Open access

false

ISSN

0031-9007

Ausgabe der Veröffentlichung

17

Zeitschrift

Physical review letters

Sprache

eng

Medium

Print

Paginierung

177201

Datum der Veröffentlichung

2020

Status

Published

Datum der Datenerfassung

2020

Titel

Harnessing Orbital-to-Spin Conversion of Interfacial Orbital Currents for Efficient Spin-Orbit Torques.

Sub types

Journal Article

Ausgabe der Zeitschrift

125

Datenquelle: Europe PubMed Central

Abstract

Current-induced spin-orbit torques (SOTs) allow for the efficient electrical manipulation of magnetism in spintronic devices. Engineering the SOT efficiency is a key goal that is pursued by maximizing the active interfacial spin accumulation or modulating the nonequilibrium spin density that builds up through the spin Hall and inverse spin galvanic effects. Regardless of the origin, the fundamental requirement for the generation of the current-induced torques is a net spin accumulation. We report on the large enhancement of the SOT efficiency in thulium iron garnet (TmIG)/Pt by capping with a CuO_{x} layer. Considering the weak spin-orbit coupling (SOC) of CuO_{x}, these surprising findings likely result from an orbital current generated at the interface between CuO_{x} and Pt, which is injected into the Pt layer and converted into a spin current by strong SOC. The converted spin current decays across the Pt layer and exerts a "nonlocal" torque on TmIG. This additional torque leads to a maximum colossal enhancement of the SOT efficiency of a factor 16 for 1.5 nm of Pt at room temperature, thus opening a path to increase torques while at the same time offering insights into the underlying physics of orbital transport, which has so far been elusive.

Date of acceptance

2020

Autoren

Shilei Ding
Andrew Ross
Dongwook Go
Lorenzo Baldrati
Zengyao Ren
Frank Freimuth
Sven Becker
Fabian Kammerbauer
Jinbo Yang
Gerhard Jakob
Yuriy Mokrousov
Mathias Kläui

Autoren-URL

https://www.ncbi.nlm.nih.gov/pubmed/33156648

DOI

10.1103/PhysRevLett.125.177201

eISSN

1079-7114

Ausgabe der Veröffentlichung

17

Zeitschrift

Phys Rev Lett

Sprache

eng

Country

United States

Paginierung

177201

Datum der Veröffentlichung

2020

Status

Published

Titel

Harnessing Orbital-to-Spin Conversion of Interfacial Orbital Currents for Efficient Spin-Orbit Torques.

Sub types

Journal Article

Ausgabe der Zeitschrift

125

Datenquelle: PubMed

Author's licence

InCopyright

Autoren

Shilei Ding
Andrew Ross
Dongwook Go
Lorenzo Baldrati
Zengyao Ren
Frank Freimuth
Sven Becker
Fabian Kammerbauer
Jinbo Yang
Gerhard Jakob
Yuriy Mokrousov
Mathias Kläui

Hosting institution

Universitätsbibliothek Mainz

Sammlungen

JGU-Publikationen

Resource version

Accepted version

DOI

10.1103/PhysRevLett.125.177201

File(s) embargoed

false

Open access

true

ISSN

0031-9007

Ausgabe der Veröffentlichung

7

Zeitschrift

Physical review letters

Schlüsselwörter

530 Physik
530 Physics

Sprache

eng

Open access status

Open Access

Paginierung

Art. 177201

Datum der Veröffentlichung

2020

Public URL

https://openscience.ub.uni-mainz.de/handle/20.500.12030/5389

Herausgeber

American Physical Society

Herausgeber URL

https://doi.org/10.1103/PhysRevLett.125.177201

Datum der Datenerfassung

2020

Datum, an dem der Datensatz öffentlich gemacht wurde

2020

Zugang

Public

Titel

Harnessing orbital-to-spin conversion of interfacial orbital currents for efficient spin-orbit torques

Ausgabe der Zeitschrift

125

Files

ding_shilei-harnessing_orb-20201123140053493.pdf

Datenquelle: OPENSCIENCE.UB

Harnessing Orbital-to-Spin Conversion of Interfacial Orbital Currents for Efficient Spin-Orbit Torques

Files

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