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arXiv 2409.03056cond-mat.mes-hall
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基于原子模拟与粒子模拟的周期衬底上斯格明子孤子运动

Skyrmion soliton motion on periodic substrates by atomistic and particle based simulations

J. C. B. Souza, N. P. Vizarim, C. J. O. Reichhardt, C. Reichhardt, P. A. Venegas

AI总结:

本文通过原子模型与粒子模型对比研究周期缺陷阵列上斯格明子孤子运动,发现两种模型在锁定角度和驱动力范围上存在差异,并揭示了孤子作为信息载体的潜力。

摘要:

我们利用原子模型和基于粒子的模型,比较了磁性斯格明子在略高于公度条件下与方形和三角形缺陷阵列相互作用的动力学行为。在外加驱动力作用下,初始运动是一个穿过被钉扎斯格明子晶格的扭结。对于方形缺陷阵列,两种模型吻合良好,并表现出孤子运动沿45$^\circ$方向锁定的区域。原子模型还产生了孤子沿30$^\circ$方向的锁定,而基于粒子的模型则没有。对于三角形缺陷阵列,原子模型在较宽的外加驱动力值范围内表现出锁定在30$^\circ$方向的孤子运动。相比之下,基于粒子的模型仅在很小的外加驱动力值范围内给出锁定在45$^\circ$方向的孤子运动。这种差异的产生是因为不可变形的粒子模型促进了蜿蜒的斯格明子轨道,而可变形的原子模型则使斯格明子之间的相互作用更强,从而减弱了蜿蜒运动。我们的结果表明,在周期衬底上穿过被钉扎斯格明子晶格的孤子运动是一种稳健的效应,并可能为利用孤子作为信息载体开辟可能性。我们的结果还使人们更好地理解基于粒子的斯格明子模型最适合的适用条件。

英文摘要:

We compare the dynamical behavior of magnetic skyrmions interacting with square and triangular defect arrays just above commensuration using both an atomistic model and a particle-based model. Under an applied drive, the initial motion is a kink traveling through the pinned skyrmion lattice. For the square defect array, both models agree well and show a regime in which the soliton motion is locked along 45$^\circ$. The atomistic model also produces locking of a soliton along 30$^\circ$, while the particle-based model does not. For the triangular defect array, the atomistic model exhibits soliton motion locked to 30$^\circ$ over a wide region of external driving force values. In contrast, the particle-based model gives soliton motion locked to 45$^\circ$ over only a small range of external driving force values. The difference arises because the nondeforming particle model facilitates meandering skyrmion orbits while the deformable atomistic model enables stronger skyrmion-skyrmion interactions that reduce the meandering. Our results indicate that soliton motion through pinned skyrmion lattices on a periodic substrate is a robust effect and could open the possibility of using solitons as information carriers. Our results also provide a better understanding of the regimes for which particle-based models of skyrmions are best suited.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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