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arXiv 2310.11596cond-mat.mes-hall
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Skyrmion在漏斗几何结构中的输运与湮灭

Skyrmion Transport and Annihilation in Funnel Geometries

F. S. Rocha, J. C. Bellizotti Souza, N. P. Vizarim, C. J. O. Reichhardt, C. Reichhardt, P. A. Venegas

AI总结:

通过原子尺度模拟研究了电流驱动下skyrmion在漏斗阵列中的输运与湮灭,发现随电流和开口尺寸变化存在钉扎、无湮灭输运、伴随湮灭输运、完全湮灭及重入钉扎五个相,为控制skyrmion输运和界定湮灭条件提供了指导。

摘要:

利用原子尺度模拟,我们研究了在垂直于漏斗轴的电流作用下,skyrmion与漏斗阵列相互作用时的输运与湮灭过程。我们发现,在低电流下可以实现无湮灭的输运,此时运动由skyrmion-skyrmion相互作用主导,skyrmion相互推挤通过漏斗开口。当电流较高时会发生skyrmion湮灭,此时位于样品上半部分的skyrmion在外部电流作用下对样品下半部分的skyrmion施加压力。在与漏斗壁相互作用时,skyrmion发生尺寸变化,使其更容易通过漏斗开口。我们发现了随施加电流和漏斗开口尺寸变化的多个相:(i)钉扎,(ii)无湮灭输运,(iii)伴随湮灭的输运,(iv)完全湮灭,以及(v)重入钉扎相,该相仅在极窄开口下出现。我们的研究结果为利用漏斗阵列控制skyrmion输运提供了深入认识,界定了skyrmion输运可行的区域以及湮灭发生的条件。

英文摘要:

Using atomistic simulations, we have investigated the transport and annihilation of skyrmions interacting with a funnel array under a current applied perpendicular to the funnel axis. We find that transport without annihilation is possible at low currents, when the motion is dominated by skyrmion-skyrmion interactions and skyrmions push each other through the funnel opening. Skyrmion annihilation occurs for higher currents when skyrmions in the upper half of the sample exert pressure on skyrmions in the bottom half of the sample due to the external current. Upon interacting with the funnel wall, the skyrmions undergo a size reduction that makes it easier for them to pass through the funnel opening. We find five phases as a function of the applied current and the size of the funnel opening: (i) pinned, (ii) transport without annihilation, (iii) transport with annihilation, (iv) complete annihilation, and (v) a reentrant pinning phase that only occurs for very narrow openings. Our findings provide insight into how to control skyrmion transport using funnel arrays by delineating regimes in which transport of skyrmions is possible as well as the conditions under which annihilation occurs.

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