Spin-torque-driven gigahertz magnetization dynamics in the non-collinear antiferromagnet Mn3Sn

IF 34.9 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Nature nanotechnology Pub Date : 2025-02-03 DOI:10.1038/s41565-025-01859-7

Won-Bin Lee, Seongmun Hwang, Hye-Won Ko, Byong-Guk Park, Kyung-Jin Lee, Gyung-Min Choi

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Abstract

Non-collinear antiferromagnets, such as Mn3Sn, stand out for their topological properties and potential in antiferromagnetic spintronics. This emerging field aims at harnessing ultrafast magnetization dynamics of antiferromagnets through spin torques. Here we report the time-resolved dynamics of Mn3Sn on a picosecond timescale, driven by an optically induced spin current pulse. Our results reveal that the magnetization of Mn3Sn tilts immediately after the spin current pulse and subsequently undergoes 70 GHz precession. This immediate tilting underscores the predominant role of damping-like torque stemming from spin current absorption by Mn3Sn. We also determine the spin coherence length of Mn3Sn to be approximately 15 nm. This value substantially exceeds that of ferromagnets, highlighting a distinct spin-dephasing process in non-collinear antiferromagnets. Our results hold promise for ultrafast applications of non-collinear antiferromagnets and enrich our understanding of their spin-transfer physics. An optically induced spin current pulse induces gigahertz magnetization dynamics in Mn3Sn with a spin coherence length of approximately 15 nm, which is longer than in ferromagnets.

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非共线反铁磁体Mn3Sn中自旋转矩驱动的千兆赫磁化动力学

非共线反铁磁体，如Mn3Sn，因其拓扑性质和反铁磁自旋电子学的潜力而脱颖而出。这一新兴领域旨在利用自旋力矩来控制反铁磁体的超快磁化动力学。在这里，我们报告了在皮秒时间尺度上，由光诱导自旋电流脉冲驱动的Mn3Sn的时间分辨动力学。我们的研究结果表明，自旋电流脉冲后，Mn3Sn的磁化强度立即倾斜，随后经历70 GHz的进动。这种直接的倾斜强调了由Mn3Sn吸收自旋电流产生的类阻尼扭矩的主要作用。我们还确定了Mn3Sn的自旋相干长度约为15 nm。这个值大大超过了铁磁体，突出了非共线反铁磁体中独特的自旋减相过程。我们的研究结果为非共线反铁磁体的超快应用提供了希望，并丰富了我们对其自旋转移物理的理解。

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来源期刊

Nature nanotechnology 工程技术-材料科学：综合

CiteScore

59.70

自引率

0.80%

发文量

196

审稿时长

4-8 weeks

期刊介绍： Nature Nanotechnology is a prestigious journal that publishes high-quality papers in various areas of nanoscience and nanotechnology. The journal focuses on the design, characterization, and production of structures, devices, and systems that manipulate and control materials at atomic, molecular, and macromolecular scales. It encompasses both bottom-up and top-down approaches, as well as their combinations. Furthermore, Nature Nanotechnology fosters the exchange of ideas among researchers from diverse disciplines such as chemistry, physics, material science, biomedical research, engineering, and more. It promotes collaboration at the forefront of this multidisciplinary field. The journal covers a wide range of topics, from fundamental research in physics, chemistry, and biology, including computational work and simulations, to the development of innovative devices and technologies for various industrial sectors such as information technology, medicine, manufacturing, high-performance materials, energy, and environmental technologies. It includes coverage of organic, inorganic, and hybrid materials.