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arXiv 1806.06334cond-mat.mes-hall
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反铁磁增强的界面Dzyaloshinskii Moriya相互作用诱导的Skyrmion形成

Skyrmion Formation Induced by Antiferromagnetic-enhanced Interfacial Dzyaloshinskii Moriya Interaction

Marco Chung Ting Ma, Yunkun Xie, Howard Sheng, S. Joseph Poon, Avik Ghosh

摘要:

Neél skyrmions起源于界面的Dzyaloshinskii Moriya相互作用(Dzyaloshinskii Moriya interaction)。最近的研究探索了使用铁磁体来承载Neél skyrmions用于器件应用。然而,将skyrmion的尺寸减小到接近10 nm仍然存在挑战。非晶态稀土-过渡金属亚铁磁体是在室温下获得超小skyrmion的有吸引力的替代材料。它们固有的垂直磁各向异性和可调磁化为Skyrmion稳定性提供了有利的环境。在这项工作中,我们采用原子随机Landau-Liftshitz-Gilbert(LLG)算法来研究界面DMI模型中GdFe中的skyrmion。在300 K下,在厚度约为5 nm的非晶GdFe薄膜中,尽管界面附近的晶格常数迅速衰减,但仍发现了近10 nm的小Skyrmion。我们还考虑了Gd-Fe对之间的符号的三种情况。结果表明,亚铁磁体中的反铁磁耦合对增强界面极化效应和稳定Skyrmion起着重要作用。这些结果表明,具有内在反铁磁耦合的亚铁磁体和反铁磁体是在室温下容纳小skyrmion的有吸引力的材料,这对于提高skyrmion器件的密度和能量效率至关重要。

英文摘要:

Neél skyrmions originate from interfacial Dzyaloshinskii Moriya interaction (DMI). Recent studies have explored using ferromagnet to host Neél skyrmions for device applications. However, challenges remain to reduce the size of skyrmion to near 10 nm. Amorphous rare-earth-transitional-metal ferrimagnets are attractive alternative materials to obtain ultrasmall skyrmions at room temperature. Their intrinsic perpendicular magnetic anisotropy and tunable magnetization provides a favorable environment for skyrmion stability. In this work, we employ atomistic stochastic Landau-Liftshitz-Gilbert (LLG) algorithm to investigate skyrmions in GdFe within the interfacial DMI model. Despite the rapid decay of DMI away from the interface, small skyrmions of near 10 nm are found in thick ~ 5 nm amorphous GdFe film at 300K. We have also considered three scenarios for the sign of DMI between Gd-Fe pair. It is revealed that antiferromagnetic coupling in the ferrimagnet plays an important role in enhancing the effect of interfacial DMI and to stabilize skyrmion. These results show that ferrimagnets and antiferromagnets with intrinsic antiferromagnetic couplings are appealing materials to host small skyrmions at room temperature, which is crucial to improve density and energy efficiency in skyrmion based devices.

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