Effects of surface oxidation on magnetic properties of amorphous alloy for choke core use

Author

Noh, Tae-Hwan ; Jang, Wan-Hee

Author_Institution

Dept. of Metall. Eng., Andong Nat. Univ., South Korea

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3388

Lastpage

3390

Abstract

In order to develop a non-gap type choke core, effects of annealing in oxygen atmosphere on magnetic properties for FeCrBSiC amorphous alloy were investigated. After annealing for 2 hrs at 480°C, optimum magnetic properties for choke core were obtained, where the effective permeability was about 400 and was almost constant up to 1 MHz, and the decrease in permeability upon large bias dc current of 16 A was very little. Furthermore it was shown that the ac magnetic loss was very low as compared to the conventional choke cores. With the increase in annealing temperature the magnetic hysteresis loop was inclined without a substantial increase of coercive force and a microstructural change of amorphous phase up to 480°C. It was considered that these choke properties were basically due to the interaction between oxidation-induced stress and magnetostriction which brought about the induced magnetic anisotropy perpendicular to the ribbon surface, and also the good soft magnetic properties of amorphous phase

Keywords

amorphous magnetic materials; annealing; boron alloys; chromium alloys; coercive force; ferromagnetic materials; inductors; iron alloys; magnetic cores; magnetic hysteresis; magnetic leakage; magnetic permeability; magnetostriction; oxidation; perpendicular magnetic anisotropy; silicon alloys; soft magnetic materials; 16 A; 2 hour; 480 degC; AC magnetic loss; FeCrBSiC; FeCrBSiC amorphous alloy; amorphous alloy; annealing; choke core use; coercive force; effective permeability; induced magnetic anisotropy; large bias DC current; magnetic hysteresis loop; magnetic properties; magnetostriction; microstructural change; nongap type choke core; oxidation-induced stress; oxygen atmosphere; ribbon surface; soft magnetic properties; surface oxidation; Amorphous materials; Annealing; Atmosphere; Inductors; Magnetic anisotropy; Magnetic cores; Magnetic properties; Magnetostriction; Oxidation; Permeability;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800533

Filename

800533