All-optical probe of magnetization precession modulated by spin-orbit torque

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Laser-induced magnetization precession modulated by an in-plane direct current was investigated in a W/CoFeB/MgO micron-sized strip using an all-optical time-resolved magneto-optical Kerr effect microscope. We observed a relatively large change in the precession frequency, owing to a current-induced spin-orbit torque. The generation efficiency of the spin-orbit torque was evaluated as-0.35 ± 0.03, which was in accordance with that evaluated from the modulation of damping. This technique may become an alternate method for the evaluation of spin-orbit torque.

Original languageEnglish
Article number122403
JournalApplied Physics Letters
Issue number12
Publication statusPublished - 2020 Sept 21

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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