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Ultralong octupole moment switching driven by twin topological spin structures
Shijie Xu1,2,3,4,5,6, Zhizhong Zhang7,8,9, Bingqian Dai10
1National Key Laboratory of Spintronics, Hangzhou International Innovation Institute, Beihang University, Hangzhou, China. shijiexu161@gmail.com.
Researchers achieved long-distance spin current transport using antiferromagnetic manganese tin (Mn3Sn) films. This breakthrough in spintronics enables electrical switching of magnetic octupoles up to 60 nm, overcoming previous distance limitations.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- Spintronics aims for advanced electronics, but conventional spin-orbit torque has limited transmission (<10 nm).
- Antiferromagnetic materials offer potential for overcoming these limitations.
Purpose of the Study:
- To investigate the potential of antiferromagnetic Mn3Sn films for long-distance spin current transport.
- To demonstrate electrical switching of magnetic octupoles in Mn3Sn using spin-orbit coupling.
Main Methods:
- Growth of Mn3Sn films with specific magnetic octupole orientation.
- Introduction of a spin-orbital coupled amorphous platinum (Pt) overlayer.
- Electrical switching experiments and direct observation of magnetic octupole dynamics.
Main Results:
- Demonstrated electrical switching of Mn3Sn layers up to 60 nm thick.
- Observed switching efficiency increasing with antiferromagnetic thickness, peaking around 40 nm.
- Validated the presence of twin topological spin orders responsible for long-distance transport.
Conclusions:
- Antiferromagnetic Mn3Sn is a robust platform for efficient spin transport.
- Twin topological spin canting intrinsically supports ultralong-distance octupole switching.
- This work highlights the long-range nature of spin-orbit torque in antiferromagnets.
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