Absence of Evidence of Electrical Switching of the Antiferromagnetic Néel Vector

Chiang, C. C.; Huang, S. Y.; Qu, D.; Wu, P. H.; Chien, C. L.

doi:10.1103/PhysRevLett.123.227203

Title: Absence of Evidence of Electrical Switching of the Antiferromagnetic Néel Vector

Journal Article · 27 November 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.123.227203 · OSTI ID:1597411

Chiang, C. C. ^[1];

^[2]; Qu, D. ^[3]; Wu, P. H. ^[2];

^[4]

Academia Sinica, Taipei (Taiwan)
National Taiwan Univ., Taipei (Taiwan)
Johns Hopkins Univ., Baltimore, MD (United States)
Academia Sinica, Taipei (Taiwan); National Taiwan Univ., Taipei (Taiwan); Johns Hopkins Univ., Baltimore, MD (United States)

Much theoretical and experimental concern has been focused on the electrical switching of the antiferromagnetic (AFM) Néel vector via spin-orbit torque. Measurements employing multiterminal patterned structures of Pt=AFM show recurring signals of the supposedly planar Hall effect and magnetoresistance, implying AFM switching. We show in this Letter that similar signals have been observed in structures with and without the AFM layer, and of an even larger magnitude using different metals and substrates. These may not be the conclusive evidence of spin-orbit torque switching of AFM, but the thermal artifacts of patterned metal structure on substrate. Furthermore, large current densities in the metallic devices, beyond the Ohmic regime, can generate unintended anisotropic thermal gradients and voltages. AFM switching requires unequivocal detection of the AFM N´eel vector before and after SOT switching.

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Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States); Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Ministry of Science and Technology of Taiwan

Contributing Organization:: King Abdullah University of Science and Technology (KAUST)

Grant/Contract Number:: SC0009390; SC0012670; OSR2017-CRG6-3427.01

OSTI ID:: 1597411

Journal Information:: Physical Review Letters, Vol. 123, Issue 22; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 96 works

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