Title :
Effects of Gamma Irradiation and Thermal Annealing on the Co-Based Amorphous Ribbon
Author :
Park, Dae-Gyu ; Song, Hongbin ; Cheong, Y.M.
Author_Institution :
Nucl. Mater. Res. Div., Korea Atomic Energy Res. Inst., Daejeon, South Korea
Abstract :
The effects of annealing and gamma irradiation on the magnetic properties of amorphous Co66Fe4B15Si15 alloys have been investigated by means of the changes in the giant magneto-impedance (GMI). The results show that there are no differences in the shape of the GMI curves for the samples which are as-quenched, annealed, gamma irradiated, and gamma irradiated after annealing. The GMI ratio showed drastic change according to the sample histories, the GMI ratio drastically increased in the annealed sample compared to as-quenched state, and this increase was recovered considerably by gamma irradiation, but no changes were observed in the as-quenched samples by gamma irradiation. These changes of GMI ratio with sample histories explained in terms of magnetic softness and the fluctuation of the circumferential/transverse anisotropy by gamma heating.
Keywords :
amorphous magnetic materials; annealing; boron alloys; cobalt alloys; ferromagnetic materials; gamma-ray effects; giant magnetoresistance; iron alloys; magnetic anisotropy; silicon alloys; Co-based amorphous ribbon; Co66Fe4B15Si15; GMI curves; GMI ratio; amorphous alloys; as-quenched state; circumferential anisotropy; gamma heating; gamma irradiation effects; giant magneto-impedance; magnetic properties; magnetic softness; thermal annealing; transverse anisotropy; Amorphous magnetic materials; Annealing; Magnetic domain walls; Magnetic domains; Magnetomechanical effects; Perpendicular magnetic anisotropy; Amorphous ribbon; gamma irradiation; giant magneto impedance (GMI); magnetic softness;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2011.2158402
