Anisotropic optical and magneto-optical properties of antiferromagnetic Weyl semimetal Mn3Sn epitaxial thin films

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

APL Materials Pub Date : 2024-09-13 DOI:10.1063/5.0225441

Dong Gao, Ting Yang, Fu Tang, Jiejun Su, Weihao Yang, Dengfu Deng, Yunfei Xie, Jun Qin, Xiao Liang, Lei Bi

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引用次数: 0

Abstract

Antiferromagnetic Weyl semimetal Mn3Sn exhibiting strong magneto-optical Kerr effect (MOKE) due to non-zero Berry curvature is attractive for spintronic and photonic device applications. Despite many reports on the anisotropic anomalous Hall effect (AHE), so far, there have been few studies on its anisotropic optical properties. In this work, we experimentally characterized the anisotropic optical and magneto-optical (MO) properties of Mn3Sn(20)/MgO(110) and Mn3Sn(0001)/Al2O3(0001) epitaxial films using ellipsometry in the wavelength range from 300 to 1690 nm. By measuring the Mueller matrix of magnetized Mn3Sn, the anisotropic permittivity tensor is determined using the 4 × 4 transfer matrix method. Temperature dependent MOKE measurement confirmed the origin of the anisotropic MO effect to the non-zero Berry curvature of the chiral magnetic phase. The measured permittivity also agrees well with first-principles calculations. The anisotropic optical and MO properties determined in this work can be useful for Mn3Sn based spintronic device characterization and photonic device development.

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反铁磁性韦尔半金属 Mn3Sn 外延薄膜的各向异性光学和磁光特性

反铁磁性韦尔半金属 Mn3Sn 由于贝里曲率不为零而表现出很强的磁光克尔效应（MOKE），这对自旋电子和光子器件的应用很有吸引力。尽管有关各向异性反常霍尔效应（AHE）的报道很多，但迄今为止，有关其各向异性光学特性的研究还很少。在这项工作中，我们利用椭偏仪在 300 到 1690 nm 波长范围内对 Mn3Sn(20)/MgO(110) 和 Mn3Sn(0001)/Al2O3(0001) 外延薄膜的各向异性光学和磁光 (MO) 特性进行了实验表征。通过测量磁化 Mn3Sn 的穆勒矩阵，利用 4 × 4 转移矩阵法确定了各向异性介电常数张量。与温度相关的 MOKE 测量证实了各向异性 MO 效应与手性磁相的非零贝里曲率有关。测得的介电常数也与第一原理计算结果十分吻合。这项研究确定的各向异性光学和 MO 特性可用于基于 Mn3Sn 的自旋电子器件表征和光子器件开发。

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

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.