The microstructure changes of CaVSn: YIG induced by energetic carbon ion bombardment

Abstract

Y 1.6Ca 1.4V 0.45Sn 0.5Fe 4.05O 12 was irradiated by 0.56 GeV C 6+ ions. The point defects induced by irradiation were detected by positron annihilation technique and high-resolution electron microscopy. The lattice constant of the sample was found to increase after the irradiation. The irradiation results in an isotropic distribution of the hyperfine magnetic field. The [Fe 3+, O 4 2−] d tetrahedral is found to be more strongly affected by irradiation than the [Fe 3+, O 6 2−] a octahedral. The existence [Fe 3+, O 3 2−] d and [Fe 3+, O 5 2−] a decreases both the superexchange field and the hyperfine magnetic field.