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Electrical Switching of Tristate Antiferromagnetic Néel Order inα−Fe2O3Epitaxial Films
Physical Review Letters ( IF 9.227 ) Pub Date : 2020-01-13 , DOI: 10.1103/physrevlett.124.027202
Yang Cheng, Sisheng Yu, Menglin Zhu, Jinwoo Hwang, and Fengyuan Yang

We demonstrate nondecaying, steplike electrical switching of tristate Néel order in Pt/α−Fe2O3 bilayers detected by the spin-Hall induced anomalous Hall effect. The as-grown Pt/α−Fe2O3 bilayers exhibit sawtooth switching behavior generated by current pulses. After annealing by a high pulse current, the Hall signals reveal single-pulse saturated, nondecaying, steplike switching. Together with control experiments, we show that the sawtooth switching is due to an artifact of Pt while the actual spin-orbit torque induced antiferromagnetic switching is steplike. Our Monte Carlo simulations explain the switching behavior of α−Fe2O3 Néel order among three in-plane easy axes.
更新日期:2020-01-14

 

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