Title :
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
fDate :
9/1/1999 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
