CoX2Y4: a family of two-dimensional magnets with versatile magnetic order†

IF 8 2区 材料科学 Q1 CHEMISTRY, PHYSICAL Nanoscale Horizons Pub Date : 2024-08-07 DOI:10.1039/D4NH00103F
Ziyuan Zhao, Zhao Liu, Mark T. Edmonds and Nikhil V. Medhekar
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Abstract

Two-dimensional (2D) magnetic materials offer a promising platform for nanoscale spintronics and for exploration of novel physical phenomena. Here, we predict a diverse range of magnetic orders in cobalt-based 2D single septuple layers CoX2Y4, namely, CoBi2Te4, CoBi2Se2Te2, CoBi2Se4, and CoSb2Te4. Notably, CoBi2Te4 presents intrinsic non-collinear antiferromagnetism (AFM), while the others display collinear AFM. The emergence of AFM in all CoX2Y4 materials is attributed to the antiferromagnetic 90° Co–Te(Se)–Co superexchange coupling. The origin of non-collinear/collinear orders lies in competing Heisenberg exchange interactions within the Co triangular lattice. A pivotal factor governing the non-collinear order of CoBi2Te4 is the vanishingly small ratio of exchange coupling between next-nearest neighbour Co and the nearest neighbour Co (J2/J1 ∼ 0.01). Furthermore, our investigation into strain effects on CoX2Y4 lattices demonstrates the tunability of the magnetic state of CoSb2Te4 from collinear to non-collinear. Our prediction of the unique non-collinear AFM in 2D suggests the potential for observing extraordinary magnetic phenomena in 2D, including non-collinear scattering and magnetic domain walls.

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CoX2Y4:具有多种磁序的二维磁体系列
二维(2D)磁性材料为纳米级自旋电子学和探索新型物理现象提供了一个前景广阔的平台。在这里,我们预测了钴基二维单七层 CoX2Y4(即 CoBi2Te4、CoBi2Se2Te2、CoBi2Se4 和 CoSb2Te4)中的各种磁序。值得注意的是,CoBi2Te4 表现出固有的非共轭反铁磁性(AFM),而其他的则表现出共轭反铁磁性。所有 CoX2Y4 材料中出现的 AFM 都归因于反铁磁性 90° Co-Te(Se)-Co 超交换耦合。非共线/共线阶的起源在于 Co 三角晶格内相互竞争的海森堡交换相互作用。影响 CoBi2Te4 非共线阶的一个关键因素是近邻 Co 与最近邻 Co 之间的交换耦合比非常小(J2/J1 ~ 0.01)。此外,我们对 CoX2Y4 晶格应变效应的研究表明,CoSb2Te4 的磁性状态可从共线到非共线进行调整。我们对二维中独特的非共线性 AFM 的预测表明,在二维中观察非同寻常的磁现象(包括非共线散射和磁畴壁)是有潜力的。
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来源期刊
Nanoscale Horizons
Nanoscale Horizons Materials Science-General Materials Science
CiteScore
16.30
自引率
1.00%
发文量
141
期刊介绍: Nanoscale Horizons stands out as a premier journal for publishing exceptionally high-quality and innovative nanoscience and nanotechnology. The emphasis lies on original research that introduces a new concept or a novel perspective (a conceptual advance), prioritizing this over reporting technological improvements. Nevertheless, outstanding articles showcasing truly groundbreaking developments, including record-breaking performance, may also find a place in the journal. Published work must be of substantial general interest to our broad and diverse readership across the nanoscience and nanotechnology community.
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