Browsing School of Engineering by Author "FANNIN, PAUL"
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An experimental study of the dynamic properties of nanoparticle colloids with identical magnetization but different particle size
FANNIN, PAUL (2012)Measurements of the frequency dependent complex magnetic susceptibility, ?(?)=??(?)?i??(?), have been used to determine the dynamic properties of three specially prepared 400 G (0.04 T) magnetic fluids. The samples, denoted ... -
An improved technique for the measurement of the complex susceptibility of magnetic colloids in the microwave region
FANNIN, PAUL; COUPER, COLIN STUART (Elsevier, 2010)Measurements by means of the short-circuit (S/C) and open circuit (O/C) transmission line techniques are well established methods for investigating the magnetic and dielectric properties of magnetic colloids, respectively. ... -
Intra-well relaxation process in magnetic fluids subjected to strong polarising fields
FANNIN, PAUL (Elsevier, 2011)We report on the frequency and field dependent complex magnetic susceptibility measurements of a kerosene-based magnetic fluid with iron oxide nanoparticles, stabilized with oleic acid, in the frequency range 0.1?6 GHz and ... -
Microwave absorbent properties of nanosized cobalt ferrite powders prepared by coprecipitation and subjected to different thermal treatments
FANNIN, PAUL; COUPER, COLIN STUART (Elsevier, 2011)Cobalt ferrite nanopowders were produced by means of two methods using a common precipitating agent. After precipitation, in the first method the cobalt ferrite was calcined, whilst in the second method the precipitation ... -
The resonance decay function method in the determination of the pre-factor of the neel relaxation time of single-domain nanoparticles
FANNIN, PAUL; COUPER, COLIN STUART (Elsevier, 2011)In its simple form, the relaxation time of the Neel relaxation process of the magnetic moment of single-domain particles is given by ?N=?0Nexp(?), ? being the ratio of the anisotropy energy to thermal energy. The pre-factor, ...