Magnetic Anisotropy and Dynamics of (YRBi)₃(FeGa)₅O₁₂ Garnet Thin Films Fabricated by Metal Organic Decomposition Method

Abstract

Spin dynamics and magnetic characteristics of (YRBi)₃(FeGa)₅O₁₂ thin films fabricated by metal organic decomposition (MOD) method is studied. The magnetic anisotropies of Y_1.5R_0.5Bi₁Fe₄Ga₁O₁₂ (R = Dy, Gd, or Eu) garnet films prepared by the MOD on Gd₃Ga₅O₁₂ (GGG) single crystal substrates were analyzed, and the crystalized phases of the films were also evaluated by X-ray diffraction (XRD). It is found that magnetic anisotropy of the films can be induced by a lattice difference between the film and the substrate, even though the films are made by the MOD. The damping factor of a Y₂Bi₁Fe₅O₁₂ garnet film was measured by ferromagnetic resonance using co-planer waveguide, and the measured damping factor of the Y₂Bi₁Fe₅O₁₂ film made by the MOD on GGG substrate is 0.073. The value, which shows much larger than that of other garnets, must be caused by the less crystallinity and/or the fine structure of the films.