Structure, magnetic and microwave properties of granular Fe_x(SiO_2)_(1-x) alloys obtained by mechanochemical synthesis

摘要

The structural-phase composition, magnetic and microwave properties of Fe_x(SiO_2)_(1-x) (x＝30, 70, 90, 95) nanocomposites have been studied. The composites are produced by high-energy ball milling with either Ar or acetone as a milling medium and milling time of 1 to 64 h. The microwave magnetic properties of the composite in the frequency range of 0.1 to 6 GHz are shown to depend slightly on the phase composition and be governed mainly by the particle size. Reduction of the particle size to about 1μm results in elimination of magnetic loss at frequencies below 1 GHz, which is attributed to the domain walls motion.