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

Volume

47

Issue

10

fYear

2011

Firstpage

2835

Lastpage

2837

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2011.2158402

Filename

6027777