High field magnetic study of small Fe particles dispersed in an alumina matrix

Author

Djega-Mariadassou, C. ; Dormann, J.L. ; Nogues, M. ; Villers, G. ; Sayouri, S.

Author_Institution

Lab. de Magnetisme, CNRS, Meudon, France

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

1819

Lastpage

1821

Abstract

A high-field magnetic study has been performed on small Fe particles dispersed in an alumina matrix. The absolute value of the magnetic moment and its thermal variation are obtained. A reduction of its value is observed depending on the particle size. This behavior is caused mainly by particle surface magnetic disorders; the relative fraction of the perturbed atomic layers increases when the particle size decreases. It is concluded that the magnetization behavior of small particles in a high field can be explained on the basis of three contributions: two static terms corresponding to the magnetic moment of the nonrelaxing system and the effect of anisotropy and one fluctuating term related to the finite volume effect

Keywords

alumina; iron; magnetic moments; magnetic properties of fine particles; magnetisation; Al₂O₃-Fe; Fe; finite volume effect; high-field magnetic study; magnetic moment; magnetization behavior; nonrelaxing system; particle surface magnetic disorders; perturbed atomic layers; thermal variation; Anisotropic magnetoresistance; Iron; Magnetic anisotropy; Magnetic materials; Magnetic moments; Magnetic properties; Magnetization; Magnetostatics; Perpendicular magnetic anisotropy; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104537

Filename

104537