Title :
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
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;
Conference_Titel :
Magnetics Conference, 2003. INTERMAG 2003. IEEE International
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-7647-1
DOI :
10.1109/INTMAG.2003.1230702
