钴掺杂铁石榴石中由单脉冲应变诱导的磁化进动动力学

中文摘要 AI 辅助

通过晶格激发对磁化进行超快控制为在短时间尺度上操控磁有序提供了途径，但瞬态应变在驱动磁化动力学中的作用仍知之甚少。本研究采用单泵浦-探测磁光显微技术，解析钴掺杂钇铁石榴石对单个5皮秒中红外脉冲的结构与磁响应。该激发产生局域应变场及向外传播的弹性波；同时，磁对比度在激发后下降，随后在约1.5至2纳秒的时间尺度上反转，再恢复至初始状态。结构与磁响应呈现密切相关的波长和脉冲能量依赖性，表明存在共同激发路径。结合瞬态应变的微磁模拟重现了单个畴内磁化的进动重取向，同时基本保留迷宫畴形态。这些结果确定了瞬态晶格变形是单脉冲中红外激发与钴掺杂钇铁石榴石中可逆进动磁化动力学之间的联系。

英文摘要

Ultrafast control of magnetization through lattice excitation provides a route to manipulating magnetic order on short timescales, yet the role of transient strain in driving magnetization dynamics remains poorly understood. Here, single-shot pump-probe magneto-optical microscopy is used to resolve the structural and magnetic responses of cobalt-doped yttrium iron garnet to individual 5-ps mid-infrared pulses. The excitation generates a localized strain field together with an outward-propagating elastic wave. Concurrently, the magnetic contrast decreases following excitation and subsequently reverses on a timescale of approximately 1.5-2 ns before recovering to its initial state. The structural and magnetic responses exhibit closely correlated wavelength and pulse-energy dependences, indicating a common excitation pathway. Micromagnetic simulations incorporating transient strain reproduce the precessional reorientation of the magnetization within individual domains while largely preserving the labyrinthine domain morphology. These results identify transient lattice deformation as the link between single-pulse mid-infrared excitation and reversible precessional magnetization dynamics in Co-doped yttrium iron garnet.

发表机构

• HFML-FELIX
• Radboud University, Institute for Molecules and Materials（拉德堡德大学分子与材料研究所）
• Russian Quantum Center, Skolkovo Innovation Center（俄罗斯量子中心斯科尔科沃创新中心）
• Faculty of Physics, Lomonosov Moscow State University（莫斯科国立大学物理系）
• Faculty of Physics, University of Bialytsok（比亚韦斯托克大学物理系）

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6 pages, 5 figures