Modulating above-room-temperature magnetism in Ga-implanted Fe5GeTe2 van der Waals magnets

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY APL Materials Pub Date : 2023-09-01 DOI:10.1063/5.0168468

Yanan Yuan, Daxiang Liu, Jingjing Yu, Guanhua Zhang, Xiang Chen, Ruiqi Liu, Siyu Wang, Fangfang Pei, Long Wei, Zhi Li, Junming Guo, Shouguo Wang, Zhaoliang Liao, Wensheng Yan, Ziqiang Qiu, Mengmeng Yang, Qian Li

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Abstract

The creation of van der Waals (vdW) ferromagnets with tunable Curie temperature (TC) and magnetic anisotropy is essential in developing vdW magnet-based devices. Here, we report an effective and reliable method for modulating the magnetic properties of vdW Fe5GeTe2 by site-specific Ga+ implantation. In this study, we report an easy axis in the ab-plane for bulk Fe5GeTe2 (TC = 310 K) and an axis out of the plane for thin Fe5GeTe2 flakes (TC = 290 K). Combining element-resolved photoemission electron microscopy and spatially resolved magneto-optic Kerr microscopy, we find that the implantation of a tiny amount of 10−3 Ga+·Å−3 in Fe5GeTe2 greatly enhances the TC from 290 to 360 K and switches the magnetic easy axis from the out-of-plane c axis to the ab-plane. The room-temperature x-ray magnetic circular dichroism signal is enhanced from 0% to 9% at an implantation level of 10−2 Ga+·Å−3. These results provide new opportunities for tailoring the magnetic properties of vdW materials beyond room temperature.

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砷注入Fe5GeTe2范德华磁体的室温以上磁性调制

制造具有可调居里温度（TC）和磁各向异性的范德华（vdW）铁磁体对于开发基于vdW磁体的器件至关重要。在这里，我们报道了一种通过位点特异性Ga+注入来调节vdW Fe5GeTe2磁性能的有效而可靠的方法。在这项研究中，我们报道了大块Fe5GeTe2的ab平面内的易轴（TC=310 K）和薄Fe5GeTe2薄片的平面外轴（TC＝290 K）。结合元素分辨光电发射电子显微镜和空间分辨磁光克尔显微镜，我们发现在Fe5GeTe2中注入少量的10−3 Ga+·Å−3大大提高了TC，使其从290 K提高到360 K，并将磁易轴从平面外的c轴切换到ab平面。在10−2 Ga+·Å−3的注入水平下，室温x射线磁圆二色性信号从0%增强到9%。这些结果为调整vdW材料在室温以外的磁性能提供了新的机会。

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来源期刊

APL Materials NANOSCIENCE & NANOTECHNOLOGYMATERIALS SCIE-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

9.60

自引率

3.30%

发文量

199

审稿时长

2 months

期刊介绍： APL Materials features original, experimental research on significant topical issues within the field of materials science. In order to highlight research at the forefront of materials science, emphasis is given to the quality and timeliness of the work. The journal considers theory or calculation when the work is particularly timely and relevant to applications. In addition to regular articles, the journal also publishes Special Topics, which report on cutting-edge areas in materials science, such as Perovskite Solar Cells, 2D Materials, and Beyond Lithium Ion Batteries.