Current-Induced Dynamics and Chaos of Antiferromagnetic Bimerons

A magnetic bimeron is a topologically nontrivial spin texture carrying an integer topological charge, which can be regarded as the counterpart of the skyrmion in easy-plane magnets. The controllable creation and manipulation of bimerons are crucial for practical applications based on topological spi...

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Bibliographic Details
Published in:Physical review letters 2020-01, Vol.124 (3), p.037202-037202, Article 037202
Main Authors: Shen, Laichuan, Xia, Jing, Zhang, Xichao, Ezawa, Motohiko, Tretiakov, Oleg A, Liu, Xiaoxi, Zhao, Guoping, Zhou, Yan
Format: Article
Language:English
Subjects:
Antiferromagnetism
Chaos theory
Computer simulation
Duffing equation
Hypothetical particles
Liapunov exponents
Magnets
Particle theory
Spintronics
Thin films
Topology
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Summary:A magnetic bimeron is a topologically nontrivial spin texture carrying an integer topological charge, which can be regarded as the counterpart of the skyrmion in easy-plane magnets. The controllable creation and manipulation of bimerons are crucial for practical applications based on topological spin textures. Here, we analytically and numerically study the dynamics of an antiferromagnetic bimeron driven by a spin current. Numerical simulations demonstrate that the spin current can create an isolated bimeron in the antiferromagnetic thin film via the dampinglike spin torque. The spin current can also effectively drive the antiferromagnetic bimeron without a transverse drift. The steady motion of an antiferromagnetic bimeron is analytically derived and is in good agreement with the simulation results. Also, we find that the alternating-current-induced motion of the antiferromagnetic bimeron can be described by the Duffing equation due to the presence of the nonlinear boundary-induced force. The associated chaotic behavior of the bimeron is analyzed in terms of the Lyapunov exponents. Our results demonstrate the inertial dynamics of an antiferromagnetic bimeron, and may provide useful guidelines for building future bimeron-based spintronic devices.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.124.037202