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arXiv 2005.12947cond-mat.mes-hall
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层效应对局域反转不对称磁体磁织构的影响

Layer effects on the magnetic textures in magnets with local inversion asymmetry

Etienne van Walsem, Rembert A. Duine, Marcos H. D. Guimarães

摘要:

局部反转对称性被破坏的磁体是手征磁织构如skyrmions和自旋螺旋的有趣候选者。这些磁体的性质是,每个后续层可以具有不同的Dzyaloshniski-Moriya相互作用(Dzyaloshniski-Moriya interaction),其起源于局部反演对称性破缺。鉴于这种系统的新候选者正在出现,与范德华晶体和磁性多层系统,它是有趣的,研究如何手性磁性纹理取决于层数和它们之间的耦合。在这篇文章中,我们用一个经典的海森堡自旋模型来模拟磁性层,其中每个连续的层的自旋符号交替。我们使用蒙特卡罗模拟来研究手征磁性织构,并表明磁性螺旋的节距受层间耦合和层数的影响。我们观察到偶数层的数量,在那里我们观察到的自旋螺旋的抑制奇数层的影响。我们给出了一个解释,我们的研究结果,提出了一个网络的强耦合层的系统。我们的研究结果可用于确定具有已知层数的螺旋系统,以及基于螺旋波长的可调谐性的新技术。

英文摘要:

Magnets with broken local inversion symmetries are interesting candidates for chiral magnetic textures such as skyrmions and spin spirals. The property of these magnets is that each subsequent layer can possess a different Dzyaloshniskii-Moriya interaction (DMI) originating from the local inversion symmetry breaking. Given that new candidates of such systems are emerging, with the Van der Waals crystals and magnetic multilayer systems, it is interesting to investigate how the chiral magnetic textures depend on the number of layers and the coupling between them. In this article, we model the magnetic layers with a classical Heisenberg spin model, where the sign of the DMI alternates for each consecutive layer. We use Monte Carlo simulations to examine chiral magnetic textures and show that the pitch of magnetic spirals is influenced by the interlayer coupling and the number of layers. We observe even-odd effects in the number of layers, where we observe a suppression of the spin spirals for even layer numbers. We give an explanation for our findings by proposing a net DMI in systems with strongly coupled layers. Our results can be used to determine the DMI in systems with a known number of layers, and for new technologies based on the tunability of the spiral wave length.

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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