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, Kyoung Jin Lee, Hyunsoo Yang

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25 Citations (Scopus)

Abstract

Spin-orbit torques (SOTs) 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, and understanding the combined effects of these two torque components is required for efficient SOT switching. Previous quasi-static measurements have reported an increased switching probability with the width of current pulses, as predicted considering the damping-like torque alone. 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 was 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 deterministic SOT switching and the importance of the sign correlation of the two torque components, which may shed light on the SOT switching mechanism.

Original languageEnglish
Article numbere1603099
JournalScience advances
Volume3
Issue number4
DOIs
Publication statusPublished - 2017 Apr 1

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ASJC Scopus subject areas

  • Medicine(all)

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