狄拉克节点线 MoB3 单层中的超高奈尔温度反铁磁性和超快激光控制去磁。

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2024-09-04 Epub Date: 2024-08-22 DOI:10.1021/acs.nanolett.4c02914

Zhen Gao, Fengxian Ma, Ziming Zhu, Qin Zhang, Ying Liu, Yalong Jiao, Aijun Du

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引用次数: 0

摘要

二维（2D）反铁磁（AFM）材料具有高奈尔温度（TN）、高载流子迁移率以及在外部磁场作用下的快速自旋响应，是高效自旋电子学的巨大需求。在此，我们从理论上提出了 MoB3 单层作为 AFM 自旋电子学的理想二维平台。AFM MoB3 单层具有费米级对称保护的 4 倍退化狄拉克结点线 (DNL)。它具有 865 μeV/Mo 的高磁各向异性能和 1050 K 的超高 TN 值，是二维 AFM 的最高记录之一。重要的是，我们揭示了 AFM MoB3 在激光辐照下的超快去磁过程，它能在数百飞秒的时间尺度上从 DNL 半金属态快速过渡到金属态。这项研究为利用二维高温 DNL 半金属设计先进的自旋电子学提供了一种有效方法，并为拓扑半金属的磁化超快调制开辟了新思路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Ultrahigh Néel Temperature Antiferromagnetism and Ultrafast Laser-Controlled Demagnetization in a Dirac Nodal Line MoB3 Monolayer.

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Ultrahigh Néel Temperature Antiferromagnetism and Ultrafast Laser-Controlled Demagnetization in a Dirac Nodal Line MoB₃ Monolayer.

Two-dimensional (2D) antiferromagnetic (AFM) materials boasting a high Néel temperature (T_N), high carrier mobility, and fast spin response under an external field are in great demand for efficient spintronics. Herein, we theoretically present the MoB₃ monolayer as an ideal 2D platform for AFM spintronics. The AFM MoB₃ monolayer features a symmetry-protected, 4-fold degenerate Dirac nodal line (DNL) at the Fermi level. It demonstrates a high magnetic anisotropy energy of 865 μeV/Mo and an ultrahigh T_N of 1050 K, one of the highest recorded for 2D AFMs. Importantly, we reveal the ultrafast demagnetization of AFM MoB₃ under laser irradiation, which induces a rapid transition from a DNL semimetallic state to a metallic state on the time scale of hundreds of femtoseconds. This work presents an effective method for designing advanced spintronics using 2D high-temperature DNL semimetals and opens up a new idea for ultrafast modulation of magnetization in topological semimetals.

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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.