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arXiv 2107.00767cond-mat.mes-hall
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DMI稳定Skyrmions的设计规则

Design Rules for DMI-Stabilised Skyrmions

Laurent Ranno, Maria Alfonso Moro

摘要:

磁skyrmions是拓扑对象,最近被观察到在室温下的薄膜。亚100纳米的尺寸和自旋极化电流操纵使它们成为高密度信息存储和处理的候选者。除了材料厚度,Skyrmion稳定性还涉及许多贡献:铁磁交换,磁各向异性,Dzyaloshinskiii-Moryia交换相互作用(Dzyaloshinskii-Moryia exchange interaction)和退磁能。文献中已经报道了多维相图。在这项工作中,我们提出了一个简单的双参数模型,精确的薄膜在可忽略的磁化极限,例如铁磁接近补偿和人工合成的反铁磁。它允许定义设计规则,以稳定小直径skyrmions在室温下明确估计其成核和崩溃的能量。与微磁计算的比较允许评估非零磁化强度的模型质量,并显示出良好的一致性。

英文摘要:

Magnetic skyrmions are topological objects, which have recently been observed in thin films at room temperature. Sub 100-nm sizes and spin polarised current manipulation make them candidates for high density information storage and processing. Besides material thickness, skyrmion stability involves many contributions: ferromagnetic exchange, magnetic anisotropy, Dzyaloshinskii-Moryia exchange interaction (DMI) and demagnetising energy. Multidimensional phase diagrams have been reported in the litterature. In this work we propose a simple two-parameter model, exact for thin films in the negligible magnetisation limit, e.g. ferrimagnets close to compensation and synthetic artificial antiferromagnets. It allows to define design rules to stabilize small diameter skyrmions at room temperature with explicit estimates of their nucleation and collapse energies. Comparisons to micromagnetic calculations allow to assess the model quality for non-zero magnetisation and show good agreement.

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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