Temperature dependence of spin-orbit torques in W/CoFeB bilayers

Abstract

We report on the temperature and layer thickness variation of spin-orbit torques in perpendicularly magnetized W/CoFeB bilayers. Harmonic Hall voltage measurements reveal dissimilar temperature evolutions of longitudinal and transverse effective magnetic field components. The transverse effective field changes sign at 250 K for a 2 nm thick W buffer layer, indicating a much stronger contribution from interface spin-orbit interactions compared to, for example, Ta. Transmission electron microscopy measurements reveal that considerable interface mixing between W and CoFeB is primarily responsible for this effect.

arXiv comment4 pages, 5 figures

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Cited by in corpus (6)

• Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers
• Determination of spin Hall angle in heavy metal/CoFeB-based heterostructures with interfacial spin-orbit fields
• Current-induced magnetization switching of exchange-biased NiO heterostructures characterized by spin-orbit torque
• Current-Induced magnetization switching by the high spin Hall conductivity $\alpha$-W
• Spin orbit torque-driven motion of quasi-Bloch domain wall in perpendicularly magnetized W/CoFeB/MgO structure
• Angular harmonic Hall voltage and magnetoresistance measurements of Pt/FeCoB and Pt-Ti/FeCoB bilayers for spin Hall conductivity determination