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arXiv 1809.01080cond-mat.mtrl-scicond-mat.mes-hall
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合成反铁磁体中的手征磁性层间耦合

Chiral magnetic interlayer coupling in synthetic antiferromagnets

Dong-Soo Han, Kyujoon Lee, Jan-Philipp Hanke, Yuriy Mokrousov, Kyoung-Whan Kim, Woosuk Yoo, Tae-Wan Kim, Reinoud Lavijsen, Chun-Yeol You, Henk J. M. Swagten, My… 展开作者

Dong-Soo Han, Kyujoon Lee, Jan-Philipp Hanke, Yuriy Mokrousov, Kyoung-Whan Kim, Woosuk Yoo, Tae-Wan Kim, Reinoud Lavijsen, Chun-Yeol You, Henk J. M. Swagten, Myung-Hwa Jung, Mathias Klaeui

摘要:

交换耦合是铁磁耦合的基础,是决定磁性系统静态和动态的关键因素。这种基本相互作用有两种形式--对称耦合和反对称耦合。虽然对称耦合导致铁磁性和反铁磁性,反对称耦合吸引了显着的兴趣,由于其在促进拓扑非平凡的自旋纹理,承诺高速和节能设备的主要作用。到目前为止,反对称交换耦合相当短的范围内,仅限于一个单一的磁性层已被证明,而对称耦合也导致长程层间交换耦合。在这里,我们报告的远程反对称层间交换耦合的垂直磁化合成反铁磁体与平行和反平行磁化排列丢失的组件。不对称的磁滞回线下的平面内的字段明确揭示了这种新的相互作用,这不能占现有的耦合机制,导致倾斜的磁化排列的单向性和手性性质。这可以用自旋-轨道耦合与多层膜对称性降低相结合来解释。这类新的手性相互作用为工程磁结构提供了额外的自由度,并有望实现一类新的三维拓扑结构。

英文摘要:

The exchange coupling underlies ferroic magnetic coupling and is thus the key element that governs statics and dynamics of magnetic systems. This fundamental interaction comes in two flavors - symmetric and antisymmetric coupling. While symmetric coupling leads to ferro- and antiferromagnetism, antisymmetric coupling has attracted significant interest owing to its major role in promoting topologically non-trivial spin textures that promise high-speed and energy-efficient devices. So far, the antisymmetric exchange coupling rather short-ranged and limited to a single magnetic layer has been demonstrated, while the symmetric coupling also leads to long-range interlayer exchange coupling. Here, we report the missing component of the long-range antisymmetric interlayer exchange coupling in perpendicularly magnetized synthetic antiferromagnets with parallel and antiparallel magnetization alignments. Asymmetric hysteresis loops under an in-plane field unambiguously reveal a unidirectional and chiral nature of this novel interaction, which cannot be accounted for by existing coupling mechanisms, resulting in canted magnetization alignments. This can be explained by spin-orbit coupling combined with reduced symmetry in multilayers. This new class of chiral interaction provides an additional degree of freedom for engineering magnetic structures and promises to enable a new class of three-dimensional topological structures.

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