Strain Tunability of Perpendicular Magnetic Anisotropy in van der Waals Ferromagnets VI3

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2022-12-15 DOI:10.1021/acs.nanolett.2c03156

Xi Zhang, Le Wang, Huimin Su, Xiuquan Xia, Cai Liu, Bingbing Lyu, Junhao Lin, Mingyuan Huang, Yingchun Cheng*, Jia-Wei Mei* and Jun-Feng Dai*,

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引用次数: 2

Abstract

Layered ferromagnets with strong magnetic anisotropy energy (MAE) have special applications in nanoscale memory elements in electronic circuits. Here, we report a strain tunability of perpendicular magnetic anisotropy in van der Waals (vdW) ferromagnets VI₃ using magnetic circular dichroism measurements. For an unstrained flake, the M–H curve shows a rectangular-shaped hysteresis loop with a large coercivity (1.775 T at 10 K) and remanent magnetization. Furthermore, the coercivity can be enhanced to a maximum of 2.6 T under a 3.8% external in-plane tensile strain. Our DFT calculations show that the increased MAE under strain contributes to the enhancement of coercivity. Meanwhile, the strain tunability on the coercivity of CrI₃, with a similar crystal structure, is limited. The main reason is the strong spin–orbit coupling in V³⁺ in VI₆ octahedra in comparison with that in Cr³⁺. The strain tunability of coercivity in VI₃ flakes highlights its potential for integration into vdW heterostructures.

Abstract Image

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范德华铁磁体VI3中垂直磁各向异性的应变可调性

具有强磁各向异性能的层状铁磁体在电子电路的纳米级存储元件中有着特殊的应用。在这里，我们报告了范德华(vdW)铁磁体VI3中垂直磁各向异性的应变可调性，使用磁圆二色性测量。对于未应变的薄片，M-H曲线显示出具有较大矫顽力(10k时为1.775 T)和剩余磁化强度的矩形磁滞回线。在3.8%的面内外拉伸应变下，矫顽力最大可达2.6 T。我们的DFT计算表明，应变下MAE的增加有助于矫顽力的增强。同时，晶体结构相似的CrI3的矫顽力的应变可调性有限。主要原因是VI6八面体中V3+的自旋轨道耦合较Cr3+强。VI3片矫顽力的应变可调性突出了其集成到vdW异质结构中的潜力。

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

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.