Analysis of the thickness dependence of magnetic properties and interparticle interaction of granular films

Author

Dai, Jianbiao ; Malkinski, Leszek M. ; Tang, Jinke

Author_Institution

Dept. of Phys., New Orleans Univ., LA, USA

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

2918

Lastpage

2920

Abstract

In this paper, we study the interparticle interaction among the magnetic nanoparticles in granular films and how this interaction affects their magnetic properties. Attention has been paid to the thermal stability and coercivity of Cu₈₀Co₂₀ granular thin films with thickness from 7-400 nm. It is found that the blocking temperature and coercivity increase when the film thickness increases until the thickness is larger than a critical value. These effects have been analyzed due to the magnetic dipolar interaction. Our analysis shows that the interaction energy is a function of film thickness. The magnetic long-range order has been introduced in our model. Theoretical approaches of the thickness dependence of blocking temperature and coercivity have been given and they are in agreement with the experimental data

Keywords

cobalt alloys; coercive force; copper alloys; discontinuous metallic thin films; magnetic thin films; nanostructured materials; thermal stability; 7 to 400 nm; Cu₈₀Co₂₀; blocking temperature; coercivity; film thickness; granular films; interaction energy; interparticle interaction; magnetic dipolar interaction; magnetic long-range order; magnetic nanoparticles; thermal stability; thickness dependence; Cobalt; Coercive force; Copper; Magnetic analysis; Magnetic anisotropy; Magnetic films; Magnetic materials; Magnetic properties; Perpendicular magnetic anisotropy; Temperature dependence;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908627

Filename

908627