Quantum sensing of broadband spin dynamics and magnon transport in antiferromagnets

IF 11.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2025-06-27

Alex L. Melendez, Shekhar Das, Francisco Ayala Rodriguez, I-Hsuan Kao, Wenhao Liu, Archibald J. Williams, Bing Lv, Joshua Goldberger, Shubhayu Chatterjee, Simranjeet Singh, P. Chris Hammel

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Abstract

Optical detection of magnetic resonance using quantum spin sensors (QSSs) provides a spatially local and sensitive technique to probe spin dynamics in magnets. However, its utility as a probe of antiferromagnetic resonance (AFMR) remains an open question. We report the experimental demonstration of optically detected AFMR in layered van der Waals antiferromagnets (AFM) up to frequencies of 24 gigahertz. We leverage QSS spin relaxation due to low-frequency magnetic field fluctuations arising from collective dynamics of magnons excited by the uniform AFMR mode. First, through AFMR spectroscopy, we characterize the intrinsic exchange fields and magnetic anisotropies of the AFM. Second, using the localized sensitivity of the QSS, we demonstrate magnon transport over tens of micrometers. Last, we find that optical detection efficiency increases with increasing frequency. This showcases the dual capabilities of QSS as detectors of high-frequency magnetization dynamics and magnon transport, paving the way for understanding and controlling the magnetism of antiferromagnets.

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反铁磁体中宽带自旋动力学和磁振子输运的量子传感

利用量子自旋传感器（qss）进行磁共振光学探测，为探测磁体中的自旋动力学提供了一种空间局域和灵敏的技术。然而，它作为反铁磁共振（AFMR）探针的效用仍然是一个悬而未决的问题。我们报告了在24千兆赫频率的层状范德华反铁磁体（AFM）中光学检测AFMR的实验演示。我们利用由均匀AFMR模式激发的磁振子集体动力学引起的低频磁场波动引起的QSS自旋弛豫。首先，通过AFMR光谱，我们表征了AFM的本征交换场和磁各向异性。其次，利用QSS的局域灵敏度，我们演示了几十微米范围内的磁振子输运。最后，我们发现光学检测效率随频率的增加而增加。这展示了QSS作为高频磁化动力学和磁振子输运探测器的双重能力，为理解和控制反铁磁体的磁性铺平了道路。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.