Initial susceptibilities of magnetic fluids dispersing Mn-Zn ferrite and cobalt ferrite particles

Author

Nakatsuka, K. ; Jeyadevan, B.

Author_Institution

Dept. of Resources Eng., Tohoku Univ., Sendai, Japan

Volume

30

Issue

6

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

4671

Lastpage

4673

Abstract

The magnetic and hydrodynamic properties of magnetic fluid depend on the micro behavior of the particles in the media. In this paper, we discuss the relaxation mechanism of Mn-Zn and cobalt ferrite particles in kerosene based magnetic fluid by measuring the initial susceptibilities in the temperature range of 83-293 K. The Mn-Zn ferrite magnetic fluid was found to consist almost only of superparamagnetic (SP) particles, where as the cobalt ferrite magnetic fluid consists of non-SP particles that relax through Brownian rotation for fields less than 440 Oe and influence the magnetic and hydrodynamic properties of the fluid

Keywords

cobalt compounds; ferrites; magnetic fluids; magnetic particles; magnetic relaxation; magnetic susceptibility; manganese compounds; superparamagnetism; zinc compounds; 83 to 293 K; Brownian rotation; Co ferrite particles; CoFe₂O₄; Mn-Zn ferrite; MnZnFe₂O₄; hydrodynamic properties; initial susceptibilities; kerosene; magnetic fluids; magnetic properties; microbehavior; relaxation mechanism; superparamagnetic particles; Cobalt; Ferrites; Hydrodynamics; Magnetic field measurement; Magnetic liquids; Magnetic properties; Magnetic susceptibility; Particle measurements; Rotation measurement; Temperature distribution;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.334185

Filename

334185