Field-free spin orbit torque switching of synthetic antiferromagnet through interlayer Dzyaloshinskii-Moriya interaction

Zilu Wang (Corresponding author), Pingzhi Li, Yuxuan Yao, Youri L.W. van Hees, Casper F. Schippers, Reinoud Lavrijsen, Albert Fert, Weisheng S. Zhao, Bert Koopmans

Research output: Contribution to journalArticleAcademic

Abstract

Perpendicular synthetic antiferromagnets (SAFs) are of interest for the next generation ultrafast, high density spintronic memory and logic devices. However, to energy efficiently operate their magnetic order by current-induced spin orbit torques (SOTs), an unfavored high external field is conventionally required to break the symmetry. Here, we theoretically and experimentally demonstrate the field-free SOT switching of a perpendicular SAF through the introduction of interlayer Dzyaloshinskii-Moriya interaction (DMI). By macro-spin simulation, we show that the speed of field-free switching increases with the in-plane mirror asymmetry of injected spins. We experimentally observe the existence of interlayer DMI in our SAF sample by an azimuthal angular dependent anomalous Hall measurement. Field-free switching is accomplished in such a sample and the strength of the effective switching field demonstrates its origin from interlayer DMI. Our results provide a new strategy for SAF based high performance SOT devices.
Original languageEnglish
Article number2205.04740
Number of pages27
JournalarXiv
Volume2022
DOIs
Publication statusPublished - 10 May 2022

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