Surface acoustic wave driven ferromagnetic resonance in nickel thin films: Theory and experiment
Surface acoustic wave driven ferromagnetic resonance in nickel thin films: Theory and experiment
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DOI：
10.1103/physrevb.86.134415
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发表时间：
2012-10-17
影响因子：
3.7
通讯作者：
Goennenwein, S. T. B.
中科院分区：
文献类型：
--
作者：
Dreher, L.;Weiler, M.;Goennenwein, S. T. B.
我们对表面声波驱动的铁磁共振进行了广泛的实验和理论研究。在基于朗道 - 利夫希茨 - 吉尔伯特方程的第一种建模方法中，我们推导了磁弹性驱动下磁化动力学的表达式，这些表达式用于计算磁共振时吸收的微波功率以及铁磁体/正常金属界面附近进动磁化产生的自旋电流密度。在第二种建模方法中，我们通过自洽地求解弹性波方程和朗道 - 利夫希茨 - 吉尔伯特方程来处理磁化动力学对弹性波的反作用，从而获得声波相移和衰减的解析解。我们将这两种建模方法与实验记录的铌酸锂/镍表面声波混合器件的复数正向传输进行比较，该传输是外部磁场方向和大小的函数，我们在三个不同平面内旋转磁场并采用三种不同的表面声波频率。我们发现，对于所有磁场配置和频率，使用一组参数时，实验观察到的功率吸收和表面声波相移与我们的建模预测在定量上是一致的。
We present an extensive experimental and theoretical study of surface acoustic wave driven ferromagnetic resonance. In a first modeling approach based on the Landau-Lifshitz-Gilbert equation, we derive expressions for the magnetization dynamics upon magnetoelastic driving that are used to calculate the absorbed microwave power upon magnetic resonance as well as the spin-current density generated by the precessing magnetization in the vicinity of a ferromagnet/normal metal interface. In a second modeling approach, we deal with the backaction of the magnetization dynamics on the elastic wave by solving the elastic wave equation and the Landau-Lifshitz-Gilbert equation self-consistently, obtaining analytical solutions for the acoustic wave phase shift and attenuation. We compare both modeling approaches with the complex forward transmission of a LiNbO3/Ni surface acoustic wave hybrid device recorded experimentally as a function of the external magnetic field orientation and magnitude, rotating the field within three different planes and employing three different surface acoustic wave frequencies. We find quantitative agreement of the experimentally observed power absorption and surface acoustic wave phase shift with our modeling predictions using one set of parameters for all field configurations and frequencies.