室温以上范德华铁磁体 Fe3GaTe2 中的大磁各向异性

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL

The Journal of Physical Chemistry Letters Pub Date : 2024-10-21 DOI:10.1021/acs.jpclett.4c02426

Yilian Xi, Hanqing Shi, Jingwei Zhang, Heping Li, Ningyan Cheng, Hang Xu, Jiaqi Liu, Keren Li, Huaiming Guo, Haifeng Feng, Jianfeng Wang, Weichang Hao, Yi Du

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引用次数: 0

摘要

在二维范德华（vdW）材料中发现的高于室温的本征铁磁性为研究基本的二维磁性和自旋电子器件提供了一个平台，特别是最近发现的高于室温的二维范德华 Fe3GaTe2（FGaT）。然而，FGaT 中的磁机制仍然难以捉摸。本文报告了利用磁力显微镜对 FGaT 单晶随厚度变化的磁性行为进行的详细研究。室温下的海森堡交换相互作用常数 (J) 被确定为 1.32836 × 10-12 J/m。我们结合角度分辨光发射光谱和密度泛函理论进行的研究表明，FGaT 的高居里温度归因于局部铁 d 带向费米级的移动，以及铁的强巡回能力导致的磁交换效应的增强。这项研究揭示了对 FGaT 磁性的理解，为研究二维磁性材料的机理提供了一个前景广阔的平台。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Large Magnetic Anisotropy in van der Waals Ferromagnet Fe3GaTe2 above Room Temperature

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Large Magnetic Anisotropy in van der Waals Ferromagnet Fe3GaTe2 above Room Temperature

Discoveries of above-room-temperature intrinsic ferromagnetism in two-dimensional (2D) van der Waals (vdW) materials offer a platform for studying fundamental 2D magnetism and spintronic devices, especially the recently discovered above-room-temperature 2D vdW Fe₃GaTe₂ (FGaT). However, the magnetic mechanism in FGaT remains elusive. Here, a detailed investigation using magnetic force microscopy on the thickness-dependent magnetic behavior of FGaT single crystals is reported. The Heisenberg exchange interaction constant (J) at room temperature is determined to be 1.32836 × 10^–12 J/m. Our study combining angle-resolved photoemission spectroscopy and density functional theory suggests that the high Curie temperature in FGaT is attributed to the shift of the localized Fe d band toward the Fermi level as well as the enhanced magnetic exchange effect due to the strong itinerant ability of Fe. This work sheds light on the understanding of magnetism in FGaT and provides a promising platform to investigate the mechanisms of 2D magnetic materials.

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来源期刊

The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

9.60

自引率

7.00%

发文量

1519

审稿时长

1.6 months

期刊介绍： The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.