Cluster magnetic octupole induced out-of-plane spin polarization in antiperovskite antiferromagnet

Yunfeng You, Hua Bai, Xiaoyu Feng, Xiaolong Fan, Lei Han, Xiaofeng Zhou, Yongjian Zhou, Ruiqi Zhang, Tongjin Chen, Feng Pan and Cheng Song ()
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Yunfeng You: Tsinghua University
Hua Bai: Tsinghua University
Xiaoyu Feng: Lanzhou University
Xiaolong Fan: Lanzhou University
Lei Han: Tsinghua University
Xiaofeng Zhou: Tsinghua University
Yongjian Zhou: Tsinghua University
Ruiqi Zhang: Tsinghua University
Tongjin Chen: Tsinghua University
Feng Pan: Tsinghua University
Cheng Song: Tsinghua University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Out-of-plane spin polarization σz has attracted increasing interests of researchers recently, due to its potential in high-density and low-power spintronic devices. Noncollinear antiferromagnet (AFM), which has unique 120° triangular spin configuration, has been discovered to possess σz. However, the physical origin of σz in noncollinear AFM is still not clear, and the external magnetic field-free switching of perpendicular magnetic layer using the corresponding σz has not been reported yet. Here, we use the cluster magnetic octupole in antiperovskite AFM Mn3SnN to demonstrate the generation of σz. σz is induced by the precession of carrier spins when currents flow through the cluster magnetic octupole, which also relies on the direction of the cluster magnetic octupole in conjunction with the applied current. With the aid of σz, current induced spin-orbit torque (SOT) switching of adjacent perpendicular ferromagnet is realized without external magnetic field. Our findings present a new perspective to the generation of out-of-plane spin polarizations via noncollinear AFM spin structure, and provide a potential path to realize ultrafast high-density applications.

Date: 2021
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DOI: 10.1038/s41467-021-26893-6

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