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arXiv 2202.11235cond-mat.mes-hall
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Skyrmion链中的孤子运动

Soliton Motion in Skyrmion Chains

N. P. Vizarim, J. C. Bellizotti Souza, C. J. O. Reichhardt, C. Reichhardt, M. V. Milosevic, P. A. Venegas

摘要:

利用基于粒子的模型,我们研究了包含嵌入一维界面的准一维(1D)和二维(2D)系统中Skyrmion链中孤子的脱钉运动。孤子的形式是一个粒子或空穴在一个相称链的skyrmions。在外加驱动下,仅在临界脱钉阈值以上,孤子以零的Skyrmion Hall角移动。对于更高的驱动,整个链depins,并在一个2D系统中,我们观察到,孤子和链运动在零skyrmion霍尔角,然后过渡到一个有限的skyrmion霍尔角的驱动增加。在具有与驱动方向成角度的1D界面的2D系统中,可以存在斯基尔米恩霍尔角的符号从正到负的反转。我们的研究结果表明,孤子在skyrmion系统中可以用作信息载体的跑道几何形状,将避免有限skyrmion霍尔角的缺点。孤立子状态变得移动在显着较低的驱动器比skyrmion链本身的脱钉过渡。

英文摘要:

Using a particle-based model we examine the depinning motion of solitons in skyrmion chains in quasi-one dimensional (1D) and two-dimensional (2D) systems containing embedded 1D interfaces. The solitons take the form of a particle or hole in a commensurate chain of skyrmions. Under an applied drive, just above a critical depinning threshold the soliton moves with a skyrmion Hall angle of zero. For higher drives, the entire chain depins, and in a 2D system we observe that both the solitons and chain move at zero skyrmion Hall angle and then transition to a finite skyrmion Hall angle as the drive increases. In a 2D system with a 1D interface that is at an angle to the driving direction, there can be a reversal of the sign of the skyrmion Hall angle from positive to negative. Our results suggest that solitons in skyrmion systems could be used as information carriers in racetrack geometries that would avoid the drawbacks of finite skyrmion Hall angles. The soliton states become mobile at significantly lower drives than the depinning transition of the skyrmion chains themselves.

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