Static and dynamic magnetic properties of fine CoNi and FeCoNi particles synthesized by the polyol process

Author

Toneguzzo, Philippe ; Acher, Olivier ; Viau, Guillaume ; Pierrard, Angélique ; Fiévet-Vincent, Franqoise ; Fiévet, Fernand ; Rosenman, Izio

Author_Institution

CEA Le Ripault, Monts, France

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3469

Lastpage

3471

Abstract

Fine CoNi and FeCoNi particles elaborated by the polyol process over a wide size range display a core shell texture. From the study of the coercivity and remanence against the particle size, the critical size below which the CoNi particles are single domains is estimated in the 20-40 nm range. The comparison between static and dynamic properties shows that exchange resonance modes are observed for nonsingle domain particles. Anisotropy constants are found to increase as the particle size decreases and as the Co content increases

Keywords

cobalt alloys; coercive force; exchange interactions (electron); ferromagnetic materials; iron alloys; magnetic anisotropy; magnetic particles; nickel alloys; particle size; remanence; texture; 20 to 40 nm; CoNi; FeCoNi; anisotropy constants; coercivity; core shell texture; dynamic magnetic properties; exchange resonance modes; fine particles; nonsingle domain particles; remanence; Coercive force; Displays; Electrons; Magnetic anisotropy; Magnetic hysteresis; Magnetic properties; Perpendicular magnetic anisotropy; Powders; Saturation magnetization; Temperature measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800560

Filename

800560