Magnetic studies on spherical monodispersed Co nanoparticles

Author

Pakhomov, A.B. ; Yuping Bao ; Beerman, M. ; Krishnan, K.M.

Author_Institution

Dept. of Mater. Sci., Washington Univ., Seattle,WA, USA

fYear

2003

fDate

March 30 2003-April 3 2003

Abstract

In this paper, we report a detailed investigation of temperature dependences of magnetization of powders of monodispersed /spl epsi/-Co particles. In the zero-field-cooled and field-cooled low field magnetization measurements, we observe two size-dependent and one size-independent features, corresponding to (I) blocking of moments of nanoparticles, (II) a second phase peak, and (III) a feature which may be associated with freezing of surface moments. For small particles, field-induced interaction effects on the blocking temperature (I) has also been observed.

Keywords

cobalt; demagnetisation; disperse systems; ferromagnetic materials; magnetic moments; magnetic particles; magnetisation; nanoparticles; particle size; Co; field-induced interaction effects; magnetic properties; magnetization; moment blocking; second phase peak; size-dependent features; size-independent features; spherical monodispersed Co nanoparticles; surface moment freezing; temperature dependences; Magnetic field measurement; Magnetic particles; Magnetization; Materials science and technology; Nanoparticles; Particle measurements; Powders; Size measurement; Temperature dependence; Temperature distribution;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2003. INTERMAG 2003. IEEE International

Conference_Location

Boston, MA, USA

Print_ISBN

0-7803-7647-1

Type

conf

DOI

10.1109/INTMAG.2003.1230702

Filename

1230702