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arXiv 1501.05511cond-mat.mtrl-scicond-mat.mes-hall
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Co/Pt界面上Dzyaloshinskiii-Moriya相互作用的剖析

Anatomy of Dzyaloshinskii-Moriya Interaction at Co/Pt Interfaces

Hongxin Yang, André Thiaville, Stanislas Rohart, Albert Fert, Mairbek Chshiev

摘要:

自旋之间的Dzyaloshinskiii-Moriya相互作用(Dzyaloshinskii-Moriya Interaction,简称DZ-M)是由缺乏反转对称性的磁性材料中的自旋-轨道耦合引起的。铁磁层在铁磁(FM)和重铁磁(NM)金属之间的界面上起着至关重要的作用,形成了称为磁skyrmions的拓扑结构,这对超密度信息存储和自旋电子器件非常有吸引力。自旋轨道力矩驱动的快畴壁(DW)动力学也起着至关重要的作用。在这里,我们提出的第一性原理计算澄清的主要特点和微观机制的Co/Pt双层膜中的掺杂。被发现主要位于界面Co层,起源于相邻NM层提供的自旋轨道能量。此外,没有直接的相关性被发现在Pt的磁性和邻近感生之间。这些结果澄清了潜在的机制,在FM/NM双层,并应有助于优化材料组合的skyrmion和DW为基础的存储和存储设备。

英文摘要:

The Dzyaloshinskii-Moriya Interaction (DMI) between spins is induced by spin-orbit coupling in magnetic materials lacking inversion symmetry. DMI is recognized to play a crucial role at the interface between ferromagnetic (FM) and heavy nonmagnetic (NM) metals to create topological textures called magnetic skyrmions which are very attractive for ultra-dense information storage and spintronic devices. DMI also plays an essential role for fast domain wall (DW) dynamics driven by spin-orbit torques. Here, we present first principles calculations which clarify the main features and microscopic mechanisms of DMI in Co/Pt bilayers. DMI is found to be predominantly located at the interfacial Co layer, originating from spin-orbit energy provided by the adjacent NM layer. Furthermore, no direct correlation is found between DMI and proximity induced magnetism in Pt. These results clarify underlying mechanisms of DMI at FM/NM bilayers and should help optimizing material combinations for skyrmion- and DW-based storage and memory devices.

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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