Unconventional spin-orbit torques from sputtered MoTe2 films

Li, Shuchen; Gibbons, Jonathan; Chyczewski, Stasiu; Liu, Zetai; Ni, Hsu-Chih; Qian, Jiangchao; Zuo, Jian-Min; Zheng, Jun-Fei; Zhu, Wenjuan; Hoffmann, Axel

doi:10.1103/physrevb.110.024426

Unconventional spin-orbit torques from sputtered MoTe₂ films

Journal Article · Tue Jul 23 00:00:00 EDT 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.110.024426· OSTI ID:2406393

Li, Shuchen ^[1]; Gibbons, Jonathan ^[2]; ^[3]; Liu, Zetai ^[3]; ^[3]; ^[3]; Zuo, Jian-Min ^[3]; Zheng, Jun-Fei ^[4]; Zhu, Wenjuan ^[3]; Hoffmann, Axel ^[3]

University of Illinois Urbana-Champaign, IL (United States); University of Illinois Urbana-Champaign
University of Illinois Urbana-Champaign, IL (United States); University of California–San Diego, La Jolla, CA (United States)
University of Illinois Urbana-Champaign, IL (United States)
Entegris Inc., Danbury, CT (United States)

Materials with strong spin-orbit coupling and low crystalline symmetry are promising for generating large unconventional spin-orbit torques (SOTs), such as in-plane fieldlike (FL) torques and out-of-plane dampinglike (DL) torques, which can effectively manipulate and deterministically switch an out-of-plane magnetization without the need for additional external in-plane magnetic fields. Here, we report SOTs generated by magnetron-sputtered 1⁢T' MoTe₂/Permalloy (Py; Ni₈₀⁢Fe₂₀)/MgO heterostructures using both spin-torque ferromagnetic resonance (ST-FMR) and second harmonic Hall measurements. We observed unconventional FL and DL torques in our samples due to spins polarized normal to the interface of MoTe₂ and Py layers, and studied the influence of crystallographic order and MoTe₂ layer thickness on the SOTs. By comparing the Raman spectra of 1⁢T' MoTe₂ samples prepared in different ways, we found a tensile strain in sputtered MoTe₂ films, which might further enhance the generation of unconventional torques by reducing the symmetry of 1⁢T' MoTe₂.

View Accepted Manuscript (DOE)

Research Organization:: University of Illinois Urbana-Champaign, IL (United States)

Sponsoring Organization:: Entegris Incorporated; National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0019273; SC0022060

OSTI ID:: 2406393

Alternate ID(s):: OSTI ID: 2473801

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 110; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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