STUDY OF MAGNETIC ANISOTROPY OF MAGNETIC RECORDING MEDIA USING FMR

点击翻译按钮获取中文摘要

The anisotropy field of the magnetic recording media determines the recording density ; the study on the anisotropy field is important.In this study, the magenetic anisotropy fields of Co films evaporated by ultrahigh evaporation, Co-CoO evaporated films and particulate-metal audio tapes have been studied using ferromagnetic resonance at 34 GHz. These works were followed by previous studies on epitaxial Fe films, metal-evaporated tapes and Ba-ferrite media.By these measurements, the ferromagnetic resonance has been proved to be a suitable for the study on the field of the films having a large saturation magnetization and particulate tapes.Meanwhile, torque method is known to be another method for the magnetic anisotropy, however, it requires a high magnetic field and the volume of the specimen must be known.The measurement for perpendicular anisotropy films by hysteresis loop has been found to be inadequate.We are planing to study sgnetic films having large perpendicular anisotropy, such as magneto-optic films of Fe-Co-Tb system.