Investigation of magnetic properties and microstructure of granular media with various double oxides including B2O3 as the grain boundary material is reported. By adding a high Tm second oxide together with B2O3 for the grain boundary material, comparable magnetic properties with that of the single oxide granular media and smaller crystallite size evaluated by X-ray diffraction (GDinplane) than that of the single oxide granular media can be obtained. Among the evaluated media, the granular medium with B2O3− TiO2 is promising for the grain boundary material, showing comparable average Ms and Ku of 806 emu/cm3 and 7.7×106 erg/cm3 with that of the single B2O3 and smaller GDinplane of 4.8 nm than that of the single B2O3 of 5.4 nm. In the TEM image, thin grain boundaries inside the grains can be observed which indicates that small grains with one-on-one grains growth is expected when an underlayer with smaller grain size is utilized.
ASJC Scopus subject areas
- Physics and Astronomy(all)