范德华异质结构中的栅极可调磁阻尼
Gate-tunable magnetic damping in van der Waals Heterostructures
- University of Regensburg（雷根斯堡大学）
- Halle-Berlin-Regensburg Cluster of Excellence CCE, University of Regensburg（哈勒-柏林-雷根斯堡卓越集群）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究通过理论模型和第一性原理计算，证明范德华异质结构中的磁阻尼可通过静电栅极实现多个数量级的电调谐，为低功耗自旋电子器件提供了新平台。
AI中文摘要：
磁阻尼的主动控制是开发低功耗、可调自旋电子器件的关键能力。在这项工作中，我们证明了二维材料的本征磁阻尼对费米能级相对于自旋轨道驱动的反交叉（即“自旋热点”）的位置高度敏感。从通过Kamberský的呼吸费米面理论评估的最小多带模型出发，我们阐明了能隙和能带排列在控制磁耗散中所起的基本作用。然后，我们将这些理论见解应用于范德华异质结构，提出了一种通过静电栅极实现强可调磁阻尼的具体机制。这一概念通过密度泛函理论计算在真实的Fe$_3$GeTe$_2$/石墨烯异质结构上得到了第一性原理验证。我们的计算表明，垂直电场选择性地移动相关能带，使得该异质结构的磁阻尼能够调制多个数量级。这些发现为电可调磁化动力学建立了一个稳健的理论框架和一个有前景的材料平台。
英文摘要：
Active control of magnetic damping is a crucial capability for the development of low-power, tunable spintronic devices. In this work, we demonstrate that the intrinsic magnetic damping of 2D materials is highly sensitive to the position of the Fermi level relative to spin-orbit driven anti-crossings, or ``spin hot spots.'' Starting from a minimal multi-band model evaluated via Kamberský's breathing Fermi surface theory, we elucidate the fundamental role that energy gaps and band alignment play in governing magnetic dissipation. We then translate these theoretical insights to van der Waals heterostructures, proposing a concrete mechanism for strongly tunable magnetic damping via electrostatic gating. This concept is validated from first principles via density functional theory calculations on a realistic Fe$_3$GeTe$_2$/graphene heterostructure. Our calculations reveal that an out-of-plane electric field selectively shifts the relevant energy bands, enabling the modulation of the heterostructure's magnetic damping over several orders of magnitude. These findings establish a robust theoretical framework and a promising materials platform for electrically tunable magnetization dynamics.
