MAGNETIC-PROPERTIES OF FESI-SIO2 GRANULAR FILMS

The ferromagnetic resonance (FMR) spectra and coercivities of FeSi-SiO 2 granular films have been measured over a wide range of FeSi volume f ractions (f(v)). The films were prepared using the ion-beam sputtering technique and transmission electron microscopy showed that the FeSi a lloy granules are embedded in a matrix of SiO2. An enhanced coercivity (H-c), as high as 329 Oe at room temperature, is observed. Far some s amples, there are several resonance peaks in the FMR spectra, which in clude one major peak and several minor peaks. The major and minor peak s correspond to the usual uniform mode and spin-wave respectively. In our experiments, the field separations between the major and the minor peaks show a complex fashion. Our results are discussed in comparison with some theoretical models.