Microwave absorption of composite magnetic fluids

Abstract Measurements of the complex magnetic susceptibility at resonance are used for an experimental study of the anisotropy field of particles within a composite magnetic fluid and to demonstrate the validity of the superposition principle, which states that the susceptibility of a mixed sample is the average of the susceptibility of its individual components. Three samples of kerosene-based magnetic fluids, namely S1, S2, and S3 were investigated. Sample S1 consisted of Ni 0.4 Zn 0.6 Fe 2 O 4 particles, sample S2 consisted of Mn 0.6 Fe 0.4 Fe 2 O 4 particles, and sample S3 was obtained by mixing S1 and S2 in a 1:1 proportion.