NiFe-YIG 颗粒膜中铁磁共振线宽的角度依赖性.

In this thesis, the measurement results of ferromagnetic resonance of nickel iron alloy yttrium iron garnet (NiFe-YIG) granular thin films are given in order to study the mechanism of linewidth broadening in the films. The 50 nm thickness of NiFe-YIG granular thin films was prepared by RF magnetron sputtering on silicon subtrate. The out of plane angle ferromagnetic resonance was mainly measured. The linewidth was separated by combining the theories of Gilbert damping, two-magnon scattering (short-range defect excitation) and mosaic effect (long-range defect excitation) . It can be found that data of linewidth and field angle are consistent with the theory. When the YIG content is low, the linewidth is mainly composed of Gilbert damping and two-magnon damping linewidth. With the increase of YIG content, the linewidth broadening effect caused by two-magnon scattering and mosaic effect increases, and the relevant basic parameters and defect information are obtained. [ABSTRACT FROM AUTHOR]