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

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademic

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Samenvatting

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.
Originele taal-2Engels
Artikelnummer2205.04740
Aantal pagina's27
TijdschriftarXiv
Volume2022
DOI's
StatusGepubliceerd - 10 mei 2022

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