Electrical switching of antiferromagnetic CoO | Pt across the Néel temperature

M.J. Grzybowski (Corresponding author), C.F. Schippers, M.E. Bal, K. Rubi, U. Zeitler, M. Foltyn, B. Koopmans, H.J.M. Swagten

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Abstract

One of the most important challenges in antiferromagnetic spintronics is the readout of the Néel vector state. High current densities up to 108 Acm-2 used in the electrical switching experiments cause notorious difficulty in distinguishing between magnetic and thermal origins of the electrical signals. To overcome this problem, we present a temperature dependence study of the transverse resistance changes in the switching experiment with CoO | Pt devices. We demonstrate the possibility to extract a pattern of spin Hall magnetoresistance for current pulses with a density of 5 × 10 7 A cm - 2 that is present only below the Néel temperature and does not follow a trend expected for thermal effects. This is the compelling evidence for the magnetic origin of the signal, which is observed using purely electrical techniques. We confirm these findings by complementary experiments in an external magnetic field. Such an approach can allow determining the optimal conditions for switching antiferromagnets and be very valuable when no imaging techniques can be applied to verify the origin of the electrical signal.

Original languageEnglish
Article number122405
Number of pages4
JournalApplied Physics Letters
Volume120
Issue number12
DOIs
Publication statusPublished - 21 Mar 2022

Bibliographical note

Funding Information:
We acknowledge J. Francke, B. van der Looij, and G. Baselmans for technical help; R. Lavrijsen and M. Zgirski for helpful discussions; and J. Dedding for the measurements of TN. We acknowledge support from HFML-RU, member of the European Magnetic Field Laboratory (EMFL). Sample fabrication was performed using NanoLabNL facilities. The research was funded by the Dutch Research Council (NWO) under Grant No. 680-91-113. The research was funded in part by the National Science Centre, Poland, under Grant Nos. 2021/40/C/ST3/00168 and 2019/34/E/ST3/00432.

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