Observation of transverse spin Nernst magnetoresistance induced by thermal spin current in ferromagnet/non-magnet bilayers

Abstract

Electric generation of spin current via spin Hall effect is of great interest as it allows an efficient manipulation of magnetization in spintronic devices. Theoretically, spin current can be also created by a temperature gradient, which is known as spin Nernst effect. Here, we report spin Nernst effect-induced transverse magnetoresistance in ferromagnet (FM)/non-magnetic heavy metal (HM) bilayers. We observe that the magnitude of transverse magnetoresistance (i.e., planar Nernst signal) in FM/HM bilayers is significantly modified by HM and its thickness. This strong dependence of transverse magnetoresistance on HM evidences the spin Nernst effect in HM; the generation of thermally-induced spin current in HM and its subsequent reflection at the FM/HM interface. Our analysis of transverse magnetoresistance shows that the spin Nernst angles of W and Pt have the opposite sign to their spin Hall angles. Moreover, our estimate implies that the magnitude of the spin Nernst angle would be comparable to that of the spin Hall angle, suggesting an efficient generation of spin current by the spin Nernst effect.

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• Spintronic thermal management
• Spin Splitting Nernst Effect in Altermagnet
• Conserved spin current for the Mott relation
• Linear Response in Topological Materials
• Magnon gravitomagnetoelectric effect in noncentrosymmetric antiferromagnetic insulators
• Origins of transverse voltages generated by applied thermal gradients and applied electric fields in ferrimagnetic-insulator/heavy-metal bilayers
• Nonlinear Seebeck effect in Ni${}_{81}$Fe${}_{19}$|Pt at room temperature
• Microscopic theory of spin Nernst effect
• Low Temperature Suppression of the Spin Nernst Angle in Pt
• Spin accumulation in the spin Nernst effect
• Evidence of magnetoelectronic electromagnon mediated transport in flexoelectronic heterostructures
• Strong spin-Hall and Nernst effects in a p-band semimetal
• Spin caloritronics: History and future prospects of experiments
• Large Spin Nernst Effect in Ni70Cu30 Alloy