Spin-Orbit Torque and Nernst Effect in Bi-Sb/Co Heterostructures

Abstract

Harmonic measurements of the longitudinal and transverse voltages in Bi-Sb/Co bilayers are presented. A large second harmonic voltage signal due to the ordinary Nernst effect is observed. In experiments where a magnetic field is rotated in the film plane, the ordinary Nernst effect shows the same angular dependence in the transverse voltage as the damping-like spin-orbit torque and in the longitudinal voltage as the unidirectional spin-Hall magneto-resistance respectively. Therefore, the ordinary Nernst effect can be a spurious signal in spin-orbit torque measurements, leading to an overestimation of the spin-Hall angle in topological insulators or semimetals.

arXiv comment5 pages, 4 figures

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• Transverse and Longitudinal Spin-Torque Ferromagnetic Resonance for Improved Measurements of Spin-Orbit Torques
• Ultrahigh efficient spin-orbit torque magnetization switching in all-sputtered topological insulator - ferromagnet multilayers
• Enhancement of spin transparency by interfacial alloying
• Acoustic spin Hall effect in strong spin-orbit metals
• Efficient Spin-Orbit Torque Switching with Non-Epitaxial Chalcogenide Heterostructures
• Spin-orbit torque characterization in a nutshell
• Interfacial and bulk spin Hall contributions to field-like spin-orbit torque generated by Iridium
• Gigantic Anisotropy of Self-Induced Spin-Orbit Torque in Weyl Ferromagnet Co2MnGa
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• Thermal effects in spintronic materials and devices: an experimentalist's guide
• Bilinear magnetoresistance in HgTe topological insulator: opposite signs at opposite interfaces demonstrated by gate control
• Negligible thermal contributions to the spin pumping signal in ferromagnetic metal-Platinum bilayers
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• The Role of Self-Torques in Transition Metal Dichalcogenide/Ferromagnet Bilayers
• Spin Hall conductivity in Bi${}_{1-x}$Sb${}_x$ as an experimental test of bulk-boundary correspondence
• Evidence of orbital Hall current induced correlation in second harmonic response of longitudinal and transverse voltage in light metal-ferromagnet bilayers
• Temperature dependence of charge-to-spin conversion in rhombohedral (110) bismuth thin film
• Decoupling of Spin-Orbit Torque Components in Py/W Bilayers unveiled through variation of W-resistivity
• Out-of-plane angle resolved second harmonic Hall analysis in perpendicular magnetic anisotropy systems
• Polar and quadratic magneto-optical Kerr effects in nonmagnetic/ferromagnet bilayers for spin-orbit torque measurements
• A15 Phase Ta3Sb Thin Films: Direct Synthesis, Charge Transport and Spin-Orbit Torque