论文标题

典型的天空与Bimerons:铁磁赛道上的长距离比赛

Typical skyrmions versus bimerons: a long-distance competition in ferromagnetic racetracks

论文作者

Araújo, A. S., Lopes, R. J. C., Carvalho-Santos, V. L., Pereira, A. R., Silva, R. L., Silva, R. C., Altbir, D.

论文摘要

在过去的几年中,磁化强度的拓扑保护集体模式引起了很多关注。其中,天空和梅隆一直是深入研究的对象。尤其是,拓扑天空是具有整数Skyrmion $ Q $的对象,而Merons的Skyrmion Charge $ Q $。在这项工作中,我们考虑了由梅隆和安提米隆(Bimeron)组成的$ Q = 1 $ Skyrmion,它在铁磁赛马场中取代,与其著名的对应物(典型的$ Q = 1 $ cylindripsysimplindrindrimpy Sylindripsysmetrical sommetrical Spemetrical Skyrmion)争论了长途竞争。两种类型的拓扑结构都会诱导马格努斯力,然后受到大厅的影响。还分析了某些材料中存在的Dzyaloshinskii-Moriya互动($ DMI $)的影响,并能够诱导$ DMI $ -Skyrmions。我们的主要目的是比较这些物体的动作(由自旋偏振电流引起的)以及它们自己的特定赛道。我们还调查了一些有利的因素,这些因素能够向竞争对手呼吸,使他们在赛道横向边界歼灭之前将其留在比赛中。一个有趣的结果是,$ dmi $ -skyrmion由于其较大的刚性而失去了这一假设种族。

During the last years, topologically protected collective modes of the magnetization have called much attention. Among these, skyrmions and merons have been the object of intense study. In particular, topological skyrmions are objects with an integer skyrmion number $Q$ while merons have a half-integer skyrmion charge $q$. In this work, we consider a $Q=1$ skyrmion, composed by a meron and an antimeron (bimeron), displacing in a ferromagnetic racetrack, disputing a long-distance competition with its more famous counterpart, the typical $Q=1$ cylindrically symmetrical skyrmion. Both types of topological structures induce a Magnus force and then are subject to the Hall effect. The influence of the Dzyaloshinskii-Moriya interaction ($DMI$) present in certain materials and able to induces $DMI$-skyrmions is also analyzed. Our main aim is to compare the motions (induced by a spin-polarized current) of these objects along with their own specific racetracks. We also investigate some favorable factors which are able to give breath to the competitors, impelling them to remain in the race for longer distances before their annihilation at the racetrack lateral border. An interesting result is that the $DMI$-skyrmion loses this hypothetical race due to its larger rigidity.

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