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.

中文翻译：

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反铁磁双体子的电流诱导动力学和混沌。

磁双聚体是带有整数拓扑电荷的拓扑非平凡的自旋纹理，可以将其视为易平面磁体中天体的对应物。对偶双子的可控创建和操纵对于基于拓扑自旋纹理的实际应用至关重要。在这里，我们通过分析和数值研究自旋电流驱动的反铁磁双聚体的动力学。数值模拟表明，自旋电流可以通过类似阻尼的自旋转矩在反铁磁薄膜中形成一个隔离的双聚体。自旋电流还可以有效地驱动反铁磁双聚体，而不会产生横向漂移。反铁磁双体子的稳态运动是通过解析得出的，并且与仿真结果非常吻合。也，我们发现，由于非线性边界感应力的存在，反铁磁双聚体的交流感应运动可以用达芬方程来描述。根据李雅普诺夫指数分析了双聚体的相关混沌行为。我们的结果证明了反铁磁双聚体的惯性动力学，并可能为构建未来基于双聚体的自旋电子器件提供有用的指导。