Title :
The effect of texture on Curie-Weiss behaviour in a frozen ferrofluid
Author :
Ayoub, N.Y. ; Abu-Aisheh, B. ; Dababneh, M. ; Laham, N. ; Popplewell, J.
Author_Institution :
Dept. of Phys., Yarmouk Univ., Irbid, Jordan
fDate :
9/1/1989 12:00:00 AM
Abstract :
The initial susceptibility χ of a textured frozen dilute magnetite (Fe3O4) ferrofluid has been measured in the temperature range 80-180 K for different freezing magnetic fields Hf. The texture is induced by cooling the ferrofluid to the solid state in the presence of an Hf of less than 220 Oe. The frozen ferrofluid exhibits Curie-Weiss behaviour. Using these results it is found that χ varies linearly with the square of Hf, which agrees with a theoretical model for a noninteracting textured fine particle system in a solid matrix. It is suggested that the presence of particle aggregates in the ferrofluid can be detected through the study of the ordering temperature
Keywords :
iron compounds; magnetic fluids; magnetic properties of dilute systems; magnetic properties of fine particles; magnetic susceptibility; texture; 80 to 180 K; Curie-Weiss behaviour; Fe3O4 frozen dilute magnetite ferrofluid; freezing magnetic fields; initial susceptibility; noninteracting textured fine particle system; ordering temperature; particle aggregates; texture; Hafnium; Magnetic anisotropy; Magnetic field measurement; Magnetic susceptibility; Particle measurements; Perpendicular magnetic anisotropy; Q measurement; Saturation magnetization; Temperature distribution; Temperature measurement;
Journal_Title :
Magnetics, IEEE Transactions on
