Absence of Evidence of Electrical Switching of the Antiferromagnetic Néel Vector
KAUST Grant NumberOSR2017-CRG6-3427.01
Permanent link to this recordhttp://hdl.handle.net/10754/668612
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AbstractMuch theoretical and experimental attention 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. 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 Néel vector before and after SOT switching.
CitationChiang, C. C., Huang, S. Y., Qu, D., Wu, P. H., & Chien, C. L. (2019). Absence of Evidence of Electrical Switching of the Antiferromagnetic Néel Vector. Physical Review Letters, 123(22). doi:10.1103/physrevlett.123.227203
SponsorsWe thank D. Y. Kang and C. T. Chen from National Taiwan University for simulation support. Work at JHU was supported by KAUST (Grant No. OSR2017-CRG6-3427.01) and the U.S. Department of Energy (Award No. DE-SC0009390 and No. SC0012670).
PublisherAmerican Physical Society (APS)
JournalPhysical Review Letters