论文标题
具有垂直磁各向异性的合成反铁磁铁的磁化动力学
Magnetization Dynamics in Synthetic Antiferromagnets with Perpendicular Magnetic Anisotropy
论文作者
论文摘要
了解垂直合成反铁磁铁（P-SAF）中磁化动力学丰富的物理学对于开发下一代旋转器设备至关重要。在这项工作中，我们系统地研究了P-SAF中的磁化动力学，结合了时间分辨的磁光光学KERR效应（TR-MOKE）测量与理论建模。这些模型分析基于结合交换耦合的Landau-Lifshitz-Gilbert方法，提供了有关磁化动态特性的详细信息，包括在不同磁场下P-SAF的振幅，方向和相位的幅度，方向和相位。这些模型预测的特性与不对称P-SAF上的TR-MOKE测量相当出色的定量一致。我们进一步揭示了在P-SAF中共存的两种游行模式的阻尼机制，并成功地从不同来源鉴定了个体贡献，包括每个铁磁层的吉尔伯特阻尼，自旋泵送和不均匀的扩展。通过集成高保真TR-MOKE测量和理论建模获得的P-SAF中磁化动力学的全面理解可以指导基于P-SAF的旋转应用架构的设计。
Understanding the rich physics of magnetization dynamics in perpendicular synthetic antiferromagnets (p-SAFs) is crucial for developing next-generation spintronic devices. In this work, we systematically investigate the magnetization dynamics in p-SAFs combining time-resolved magneto-optical Kerr effect (TR-MOKE) measurements with theoretical modeling. These model analyses, based on a Landau-Lifshitz-Gilbert approach incorporating exchange coupling, provide details about the magnetization dynamic characteristics including the amplitudes, directions, and phases of the precession of p-SAFs under varying magnetic fields. These model-predicted characteristics are in excellent quantitative agreement with TR-MOKE measurements on an asymmetric p-SAF. We further reveal the damping mechanisms of two procession modes co-existing in the p-SAF and successfully identify individual contributions from different sources, including Gilbert damping of each ferromagnetic layer, spin pumping, and inhomogeneous broadening. Such a comprehensive understanding of magnetization dynamics in p-SAFs, obtained by integrating high-fidelity TR-MOKE measurements and theoretical modeling, can guide the design of p-SAF-based architectures for spintronic applications.
