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arXiv · 1711.05367

Anomalous spin-orbit torque switching due to field-like torque-assisted domain wall reflection

Jungbum Yoon·Seo-Won Lee·Jae Hyun Kwon·Jong Min Lee·Jaesung Son·Xuepeng Qiu·Kyung-Jin Lee·Hyunsoo Yang
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Abstract

Spin-orbit torques (SOT) allow the electrical control of magnetic states. Current-induced SOT switching of the perpendicular magnetization is of particular technological importance. The SOT consists of damping-like and field-like torques so that the efficient SOT switching requires to understand combined effects of the two torque-components. Previous quasi-static measurements have reported an increased switching probability with the width of current pulses, as predicted with considering the damping-like torque only. Here we report a decreased switching probability at longer pulse-widths, based on time-resolved measurements. Micromagnetic analysis reveals that this anomalous SOT switching results from domain wall reflections at sample edges. The domain wall reflection is found to strongly depend on the field-like torque and its relative sign to the damping-like torque. Our result demonstrates a key role of the field-like torque in the deterministic SOT switching and notifies the importance of sign correlation of the two torque-components, which may shed light on the SOT switching mechanism.

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Jungbum Yoon, Seo-Won Lee, Jae Hyun Kwon, Jong Min Lee, Jaesung Son, Xuepeng Qiu, Kyung-Jin Lee, Hyunsoo Yang. 2017-11-15. Anomalous spin-orbit torque switching due to field-like torque-assisted domain wall reflection. https://doi.org/10.1126/sciadv.1603099

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