A spin–rotation mechanism of Einstein–de Haas effect based on a ferromagnetic disk

IF 6.5 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Xin Nie, Jun Li, Trinanjan Datta, Dao-Xin Yao
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Abstract

Spin–rotation coupling (SRC) is a fundamental interaction that connects electronic spins with the rotational motion of a medium. We elucidate the Einstein–de Haas (EdH) effect and its inverse with SRC as the microscopic mechanism using the dynamic spin–lattice equations derived by elasticity theory and Lagrangian formalism. By applying the coupling equations to an iron disk in a magnetic field, we exhibit the transfer of angular momentum and energy between spins and lattice, with or without damping. The timescale of the angular momentum transfer from spins to the entire lattice is estimated by our theory to be on the order of 0.01 ns, for the disk with a radius of 100 nm. Moreover, we discover a linear relationship between the magnetic field strength and the rotation frequency, which is also enhanced by a higher ratio of Young’s modulus to Poisson’s coefficient. In the presence of damping, we notice that the spin-lattice relaxation time is nearly inversely proportional to the magnetic field. Our explorations will contribute to a better understanding of the EdH effect and provide valuable insights for magneto-mechanical manufacturing.

Abstract Image

基于铁磁盘的爱因斯坦-德哈斯效应自旋旋转机制
自旋-旋转耦合(SRC)是连接电子自旋与介质旋转运动的基本相互作用。我们利用弹性理论和拉格朗日形式主义推导出的动态自旋晶格方程,阐明了爱因斯坦-德-哈斯(EdH)效应及其逆效应,并将自旋旋转耦合作为微观机制。通过将耦合方程应用于磁场中的铁盘,我们展示了有无阻尼情况下自旋和晶格之间的角动量和能量转移。根据我们的理论估算,对于半径为 100 nm 的圆盘,从自旋到整个晶格的角动量转移的时间尺度约为 0.01 ns。此外,我们还发现磁场强度与旋转频率之间存在线性关系,而杨氏模量与泊松系数之比越高,这种关系就越强。在存在阻尼的情况下,我们注意到自旋晶格弛豫时间几乎与磁场成反比。我们的探索将有助于更好地理解 EdH 效应,并为磁机械制造提供有价值的见解。
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来源期刊
Frontiers of Physics
Frontiers of Physics PHYSICS, MULTIDISCIPLINARY-
CiteScore
9.20
自引率
9.30%
发文量
898
审稿时长
6-12 weeks
期刊介绍: Frontiers of Physics is an international peer-reviewed journal dedicated to showcasing the latest advancements and significant progress in various research areas within the field of physics. The journal's scope is broad, covering a range of topics that include: Quantum computation and quantum information Atomic, molecular, and optical physics Condensed matter physics, material sciences, and interdisciplinary research Particle, nuclear physics, astrophysics, and cosmology The journal's mission is to highlight frontier achievements, hot topics, and cross-disciplinary points in physics, facilitating communication and idea exchange among physicists both in China and internationally. It serves as a platform for researchers to share their findings and insights, fostering collaboration and innovation across different areas of physics.
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