Mean-field analysis of ternary and quaternary rare earth-transition metal alloys for thermomagnetic recording

Author

Hajjar, R. ; Mansuripur, M.

Author_Institution

Opt. Sci. Center, Arizona Univ., Tucson, AZ, USA

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

4021

Lastpage

4023

Abstract

A mean-field model developed to analyze ternary (TbFeCo) and quaternary (TbGdFeCo, TbDyFeCo) alloys of interest in thermomagnetic recording is based on the localized mean-field theory and emphasizes the reduction of adjustable parameters. The experimental magnetization versus temperature curves are compared with the model predictions, and good agreement is obtained in all instances. The exchange parameters and atomic moment values obtained are consistent with the current understanding of these alloys. The possibility of including an itinerant model to account for the 3d transition-metal magnetic electrons is considered

Keywords

band model of magnetism; cobalt alloys; crystal field interactions; dysprosium alloys; exchange interactions (electron); ferrimagnetic properties of substances; gadolinium alloys; iron alloys; terbium alloys; thermomagnetic recording; 3d transition-metal magnetic electrons; TbDyFeCo thermomagnetic recording alloys; TbFeCo thermomagnetic recording alloys; TbGdFeCo thermomagnetic recording alloys; atomic moment values; exchange parameters; magnetisation/temperature curves; mean-field model; quaternary alloys; reduction of adjustable parameters; ternary alloys; Atomic measurements; Equations; Impurities; Magnetic analysis; Magnetic anisotropy; Magnetization; Optical recording; Perpendicular magnetic anisotropy; Temperature; Tin;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42510

Filename

42510