论文标题
Skyrmion惯性在合成反铁磁铁中
Skyrmion inertia in synthetic antiferromagnets
论文作者
论文摘要
我们用有限的层间耦合描述了合成反铁磁铁（SAF）中磁性天空的动力学。由于两个SAF层中的天际旋转器相反，因此耦合的天空段达到了一个固定的状态，并以空间分离为正交的速度方向。结果，与铁磁状况相反，瞬态制度必然会发生在有限的加速度，与惯性相关，这限制了其时间响应。基于两个耦合的硫核方程，这里开发的形式主义允许对此现象进行定量描述。与瞬态状态相关的时间常数与抗磁磁耦合常数成反比。我们还表明，耦合力在有限的天际分离下达到最大值。这设置了最大速度极限，超过该耦合力无法稳定结合状态。
We describe the dynamics of magnetic skyrmions in synthetic antiferromagnets (SAF), with a finite interlayer coupling. Due to the opposite gyrovector of the skyrmions in the two SAF layers, the coupled skyrmions reach a stationary regime with a spatial separation, in a direction orthogonal to their velocity. As a consequence, and contrary to the ferromagnetic situation, a transient regime necessarily occurs, with a finite acceleration, related to an inertia, and that limits its time response. The formalism developed here, based on two coupled Thiele equations, allows a quantitative description of this phenomenon. The time constant associated to the transient regime scales inversely with the antiferromagnetic coupling constant. We also show that the coupling force reaches a maximal value at a finite skyrmion separation. This sets a maximum velocity limit, beyond which the the coupling force cannot stabilize the bound state.
