Goodenough–Kanamori–Anderson high-temperature ferromagnetism in tetragonal transition-metal xenes

IF 4.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

2D Materials Pub Date : 2024-04-24 DOI:10.1088/2053-1583/ad3e08

U Yorulmaz, D Šabani, C Sevik and M V Milošević

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Abstract

Seminal Goodenough–Kanamori–Anderson (GKA) rules provide an inceptive understanding of the superexchange interaction of two magnetic metal ions bridged with an anion, and suggest fostered ferromagnetic interaction for orthogonal bridging bonds. However, there are no examples of two-dimensional (2D) materials with structure that optimizes the GKA arguments towards enhanced ferromagnetism and its critical temperature. Here we reveal that an ideally planar GKA ferromagnetism is indeed stable in selected tetragonal transition-metal xenes (tTMXs), with Curie temperature above 300 K found in CrC and MnC. We provide the general orbitally-resolved analysis of magnetic interactions that supports the claims and sheds light at the mechanisms dominating the magnetic exchange process in these structures. Furthermore, we propose the set of three GKA-like rules that will guarantee room temperature ferromagetnism. With recent advent of epitaxially-grown tetragonal 2D materials, our findings earmark tTMXs for facilitated spintronic and magnonic applications, or as a desirable magnetic constituent of functional 2D heterostructures.

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四方过渡金属烯的古德诺-卡纳莫里-安德森高温铁磁性

开创性的古德诺-卡纳莫里-安德森（GKA）规则为两个与阴离子桥接的磁性金属离子的超交换相互作用提供了一种感性认识，并提出了促进正交桥键铁磁相互作用的建议。然而，目前还没有二维（2D）材料的结构能优化 GKA 原理，从而增强铁磁性及其临界温度的例子。在这里，我们揭示了理想平面 GKA 铁磁性在选定的四方过渡金属烯（ttmxs）中确实是稳定的，在 CrC 和 MnC 中发现的居里温度高于 300 K。我们提供了对磁相互作用的一般轨道分辨分析，以支持上述说法，并揭示了在这些结构中主导磁交换过程的机制。此外，我们还提出了保证室温铁磁性的三条类似 GKA 的规则。随着最近外延生长的四方二维材料的出现，我们的研究结果预示着 tTMXs 将促进自旋电子和磁性应用，或成为功能性二维异质结构的理想磁性成分。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2D Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

10.70

自引率

5.50%

发文量

138

审稿时长

1.5 months

期刊介绍： 2D Materials is a multidisciplinary, electronic-only journal devoted to publishing fundamental and applied research of the highest quality and impact covering all aspects of graphene and related two-dimensional materials.