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利用磁振子自旋电流探测NiPS3中与尺寸相关的磁序跃迁
作者:小柯机器人 发布时间:2025/8/19 12:51:02

近日,北京大学陈剑豪团队报道了利用磁振子自旋电流探测NiPS3中与尺寸相关的磁序跃迁。这一研究成果发表在2025年8月12日出版的《中国科学:物理学 力学 天文学》杂志上。

磁基态低能激发的自旋波量子马努子不仅携带着新一代信息技术中至关重要的自旋角动量,还是研究相应基态性质的有力探针。

研究组分析了非局域磁振子输运的反铁磁范德华绝缘体NiPS3中的磁序跃迁。他们观察到临界厚度约为12 - 14nm的尺寸交叉行为。在阈值以下,热激活磁振子携带的角动量与常规情况相反,对应于具有更高对称性的残余序。而在此临界厚度以上,NiPS3表现出面内之字形反铁磁有序,对称性较低,热激活磁振子信号表现出异常的高磁场响应。

在自旋翻转跃迁之后,Néel矢量在a轴附近被强烈固定,导致检测到的信号变平,只有当磁场垂直于Néel向量时才能切换。这些发现表明,磁振子自旋电流为研究范德华磁绝缘体中的奇异序和相变提供了一种有效手段,为自旋技术的基础研究和潜在应用提供了新的见解。

附:英文原文

Title: Probing the dimension-dependent magnetic order transition in NiPS3 with magnon spin current

Author: Luo, Bingcheng, Qi, Shaomian, Liu, Shiqiang, Jia, Linhao, Kang, Xinyu, Chen, Di, Xie, X. C., Chen, Jian-Hao

Issue&Volume: 2025-08-12

Abstract: Magnon, the quanta of spin wave, low energy excitation from magnetic ground state, not only carries spin angular momentum which is of crucial importance in new generation of information technology, but also serves as powerful probes for investigating the corresponding ground-state properties. Here, we investigate magnetic order transitions in the antiferromagnetic van der Waals insulator NiPS3 using non-local magnon transport. We observe a dimensional cross-over behavior with a critical thickness of approximately 12–14 nm. Below the threshold, the thermally activated magnon carries angular momentum that is opposite to the conventional case, corresponding to the vestigial order with higher symmetry. While above this critical thickness, where NiPS3 exhibits in-plane zigzag antiferromagnetic order with lower symmetry, the thermally activated magnon signals show anomalous high-magnetic-field responses. After the spin-flop transition, the Néel vector becomes strongly pinned near the a-axis, resulting in a flattening of the detected signals that can only be switched when the magnetic field is oriented perpendicular to the Néel vector. These findings demonstrate that magnon spin currents provide an effective means to investigate exotic orders and phase transitions in van der Waals magnetic insulators, offering new insights for both fundamental research and potential applications in spin-based technologies.

DOI: 10.1007/s11433-025-2748-1

Source: https://link.springer.com/article/10.1007/s11433-025-2748-1

期刊信息

Science China Physics, Mechanics & Astronomy《中国科学:物理学 力学 天文学》,创刊于2003年。隶属于施普林格·自然出版集团,最新IF:6.4

官方网址:https://www.springer.com/journal/11433
投稿链接:https://mc03.manuscriptcentral.com/scpma