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Magnetic heterostructures consisting of high-resistivity (238 ± 5 μΩ cm)-W/CoFeB/MgO are prepared by sputtering and their spin-orbit torques are evaluated as a function of W thickness through an extended harmonic measurement. W thickness dependence of the spin-orbit torque with the Slonczewski-like symmetry is well described by the drift-diffusion model with an efficiency parameter, the so-called effective spin Hall angle, of -0.62 ± 0.03. In contrast, the field-like spin-orbit torque is one order of magnitude smaller than the Slonczewski-like torque and shows no appreciable dependence on the W thickness, suggesting a different origin from the Slonczewski-like torque. The results indicate that high-resistivity W is promising for low-current and reliable spin-orbit torque-controlled devices.

Original languageEnglish
Article number192408
JournalApplied Physics Letters
Issue number19
Publication statusPublished - 2018 May 7

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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