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4 October 2022 Sagnac interferometry for high-sensitivity optical measurements of spin-orbit torque (Conference Presentation)
Yunqiu Kelly Luo
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Proceedings Volume PC12205, Spintronics XV; PC122050R (2022) https://doi.org/10.1117/12.2633424
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States
Abstract
We develop an ultrasensitive magneto-optic method to quantify spin-orbit torques (SOT) based on a modified Sagnac magneto-optic Kerr effect (MOKE) interferometry (~ 5μRad/√Hz). The high sensitivity of Sagnac interferometry permits for the first time optical quantification of spin-orbit torque from small-angle magnetic tilting of samples with perpendicular magnetic anisotropy (PMA). We find significant disagreement between Sagnac measurements and simultaneously-performed harmonic Hall (HH) measurements of spin-orbit torque on Pt/Co/MgO and Pd/Co/MgO samples with PMA. This very surprising result demonstrates a flaw in the most-popular method for measuring spin-orbit torques in PMA samples, and represents an unsolved puzzle in understanding the planar Hall effect in magnetic thin films.
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Yunqiu Kelly Luo "Sagnac interferometry for high-sensitivity optical measurements of spin-orbit torque (Conference Presentation)", Proc. SPIE PC12205, Spintronics XV, PC122050R (4 October 2022); https://doi.org/10.1117/12.2633424
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KEYWORDS
Interferometry
Magnetism
Optical testing
Magneto-optics
Anisotropy
Cryogenics
Heterojunctions
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