Surface acoustic wave driven ferromagnetic resonance in nickel thin films: Theory and experiment
Abstract
We present an extensive experimental and theoretical study of surface acoustic wave driven ferromagnetic resonance. In a first modeling approach based on the LandauLifshitzGilbert 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 spincurrent 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 LandauLifshitzGilbert equation selfconsistently, obtaining analytical solutions for the acoustic wave phase shift and attenuation. We compare both modeling approaches with the complex forward transmission of a LiNbO_{3}/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.
 Publication:

Physical Review B
 Pub Date:
 October 2012
 DOI:
 10.1103/PhysRevB.86.134415
 arXiv:
 arXiv:1208.0001
 Bibcode:
 2012PhRvB..86m4415D
 Keywords:

 76.50.+g;
 75.30.Gw;
 75.78.n;
 75.80.+q;
 Ferromagnetic antiferromagnetic and ferrimagnetic resonances;
 spinwave resonance;
 Magnetic anisotropy;
 Magnetomechanical and magnetoelectric effects magnetostriction;
 Condensed Matter  Mesoscale and Nanoscale Physics;
 Condensed Matter  Materials Science
 EPrint:
 13 pages, 9 figures