具有超快激光可写性的非化学计量范德华铁磁体FeGaTe中室温下小于100纳米的尼尔型斯格明子

Room-temperature sub-100 nm Néel-type skyrmions in non-stoichiometric van der Waals ferromagnet FeGaTe with ultrafast laser writability.

作者信息

Li Zefang, Zhang Huai, Li Guanqi, Guo Jiangteng, Wang Qingping, Deng Ying, Hu Yue, Hu Xuange, Liu Can, Qin Minghui, Shen Xi, Yu Richeng, Gao Xingsen, Liao Zhimin, Liu Junming, Hou Zhipeng, Zhu Yimei, Fu Xuewen

机构信息

Ultrafast Electron Microscopy Laboratory, The MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, China.

Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, China.

出版信息

Nat Commun. 2024 Feb 3;15(1):1017. doi: 10.1038/s41467-024-45310-2.

DOI:10.1038/s41467-024-45310-2

PMID:38310096

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10838308/

Abstract

Realizing room-temperature magnetic skyrmions in two-dimensional van der Waals ferromagnets offers unparalleled prospects for future spintronic applications. However, due to the intrinsic spin fluctuations that suppress atomic long-range magnetic order and the inherent inversion crystal symmetry that excludes the presence of the Dzyaloshinskii-Moriya interaction, achieving room-temperature skyrmions in 2D magnets remains a formidable challenge. In this study, we target room-temperature 2D magnet FeGaTe and unveil that the introduction of iron-deficient into this compound enables spatial inversion symmetry breaking, thus inducing a significant Dzyaloshinskii-Moriya interaction that brings about room-temperature Néel-type skyrmions with unprecedentedly small size. To further enhance the practical applications of this finding, we employ a homemade in-situ optical Lorentz transmission electron microscopy to demonstrate ultrafast writing of skyrmions in FeGaTe using a single femtosecond laser pulse. Our results manifest the FeGaTe as a promising building block for realizing skyrmion-based magneto-optical functionalities.

摘要

在二维范德华铁磁体中实现室温磁斯格明子为未来的自旋电子学应用提供了无与伦比的前景。然而，由于抑制原子长程磁序的固有自旋涨落以及排除了Dzyaloshinskii-Moriya相互作用存在的固有反演晶体对称性，在二维磁体中实现室温斯格明子仍然是一项艰巨的挑战。在本研究中，我们以室温二维磁体FeGaTe为目标，并揭示向该化合物中引入铁缺陷能够打破空间反演对称性，从而诱导出显著的Dzyaloshinskii-Moriya相互作用，进而产生尺寸前所未有的小的室温奈尔型斯格明子。为了进一步增强这一发现的实际应用，我们采用自制的原位光学洛伦兹透射电子显微镜来证明使用单个飞秒激光脉冲在FeGaTe中实现斯格明子的超快写入。我们的结果表明FeGaTe是实现基于斯格明子的磁光功能的有前途的构建块。