Interfacial effects on curling mode for a coated particle

Author

Yang, Jyh-Shinn ; Chang, Ching-Ray

Author_Institution

Div. of General Educ., Nat. Taiwan Ocean Univ., Keelung, Taiwan

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

2640

Lastpage

2642

Abstract

A rigorous micromagnetic study for the nucleation by the magnetization curling mode in acicular coated particles is presented. The calculated nucleation field increases with shell thickness and saturates within observable thickness. It is found that the shell uniaxial anisotropy determines the initial slope, and that the saturation level depends on both the interfacial coupling and shell anisotropy. The shell surface anisotropy will further increase the nucleation field. A very good fitting of experimental data can be obtained by this method

Keywords

coatings; magnetic properties of fine particles; magnetisation; CoFe₂O₄; acicular coated particles; calculated nucleation field; gamma Fe₂O₃ particles; initial slope; interfacial coupling; magnetization curling mode; rigorous micromagnetic study; saturation level; shell surface anisotropy; shell thickness; shell uniaxial anisotropy; Anisotropic magnetoresistance; Coercive force; Magnetic anisotropy; Magnetic cores; Magnetization; Micromagnetics; Ocean temperature; Sea surface; Surface fitting; Surface treatment;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.280840

Filename

280840