Article Symmetry-reduced topological interface for unleashing a multidirectional spin-orbit torque

Satoshi Sugimoto SAMURAI ORCID ; Yasufumi Araki ORCID ; Yukiko K. Takahashi SAMURAI ORCID ; Jun’ichi Ieda ORCID ; Shinya Kasai SAMURAI ORCID

Supplymentary.pdf
Download all files (3.05 MB)
Collection

Citation
Satoshi Sugimoto, Yasufumi Araki, Yukiko K. Takahashi, Jun’ichi Ieda, Shinya Kasai. Symmetry-reduced topological interface for unleashing a multidirectional spin-orbit torque. Communications Physics. 2025, 8 (1), 100. https://doi.org/10.1038/s42005-025-02024-1

Description:

(abstract)

The current-induced spin-orbit torque (SOT) at heavy metal/ferromagnet (HM/FM) interfaces plays a critical role in modern spintronics. In this study, the SOT efficiency is enhanced by engineering symmetrical structures, specifically by a wedge-shaped topological material interface in R3 ̅m Bi2Te3 (001)/FM heterostructures. The symmetry of the topological interface is manipulated to lead to unconventional emergences of both out-of-plane and in-plane spin polarizations. Torque measurements show that these polarizations have conversion efficiencies up to 10%. This considerable improvement in the SOT efficiency is characterized both qualitatively and quantitatively based on the nonreciprocal ferromagnetic resonance (FMR) spectra and the SOT dependence on the magnetic field direction. The observed enhancement in the unconventional SOT is attributed to the wedge-oriented symmetry reduction of the spin-momentum locking structure of interfacial Dirac fermions. This advance opens new avenues for designing geometrically novel spintronics devices, demonstrating the potential of using multidirectional SOTs for forthcoming nanotechnological applications.

Rights:

Keyword: Spin-orbit torque, Topological Insulator, Nonreciprocal transport

Date published: 2025-03-13

Publisher: Springer Science and Business Media LLC

Journal:

  • Communications Physics (ISSN: 23993650) vol. 8 issue. 1 100

Funding:

  • MEXT | Japan Society for the Promotion of Science 24K00952
  • MEXT | Japan Society for the Promotion of Science 20K14419
  • MEXT | Japan Society for the Promotion of Science 22K03538
  • MEXT | JST | Precursory Research for Embryonic Science and Technology JPMJPR18L3

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s42005-025-02024-1

Related item:

Other identifier(s):

Contact agent:

Updated at: 2025-03-26 17:25:49 +0900

Published on MDR: 2025-03-26 17:25:50 +0900

Filename Size
Filename Article.pdf
application/pdf 		Size 2.46 MB Detail
Filename Supplymentary.pdf (Thumbnail)
application/pdf 		Size 1.44 MB Detail