Changes in magnetostriction of polycrystalline Tb-Dy-Fe casting alloys after annealing

Author

Ono, Hideaki ; Shimada, Munekatsu ; Toma, Hideo

Author_Institution

Mater. Res. Lab., Nissan Motor Co. Ltd., Yokosuka, Japan

Volume

37

Issue

2

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

1003

Lastpage

1010

Abstract

A study investigated the changes that occur in the structure and magnetostrictive properties of polycrystalline Tb-Dy-Fe casting alloys after annealing. The alloys formed a columnar structure along the thermal flow direction during casting, and the Laves phases tended to show a (110) orientation parallel to the columnar structure. The magnetostriction of the alloys under a condition of compressive prestress changed substantially as a result of annealing, and a pronounced increase in magnetostriction was observed at annealing temperatures above 750°C. After annealing, magnetostrictive properties reflected changes in magnetocrystalline anisotropy and the saturation magnetostrictive coefficient due to differences in the Tb/Dy ratio. Annealing had the effect of homogenizing the alloys and easing lattice distortion of the Laves phases

Keywords

annealing; casting; dysprosium alloys; ferromagnetic materials; iron alloys; magnetic anisotropy; magnetostriction; terbium alloys; 750 C; Laves phase; Tb-Dy-Fe; annealing; columnar structure; magnetocrystalline anisotropy; magnetostriction; polycrystalline casting alloy; prestress dependence; Anisotropic magnetoresistance; Annealing; Casting; Lattices; Magnetic anisotropy; Magnetic properties; Magnetostriction; Perpendicular magnetic anisotropy; Saturation magnetization; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.917184

Filename

917184