Title: Complex magnetic susceptibility measurement of a magnetic fluid magnetite based

Authors: O.E. Ayala-Valenzuela, J.A. Matutes-Aquino, R. Betancourt-Galindo, O. Rodriguez-Fernandez

Addresses: Centro de Investigacion en Materiales Avanzados, SC Miguel de Cervantes 120, Complejo Industrial Chihuahua, CP 31109, Chihuahua, Chih., Mexico. ' Centro de Investigacion en Materiales Avanzados, SC Miguel de Cervantes 120, Complejo Industrial Chihuahua, CP 31109, Chihuahua, Chih., Mexico. ' Centro de Investigacion en Quimica Aplicada, Blvd. Enrique Reyna Hermosillo 140 Apto. Postal 379, CP 25100, Saltillo Coahuila, Mexico. ' Centro de Investigacion en Quimica Aplicada, Blvd. Enrique Reyna Hermosillo 140 Apto. Postal 379, CP 25100, Saltillo Coahuila, Mexico

Abstract: In this work, we present the synthesis and measurement of complex magnetic susceptibility χ(ω) = χ'(ω) - χ"(ω) of a magnetite magnetic fluid, oleic acid-kerosene. Measurements were developed applying different magnetic polarising fields by means of an electromagnet. Short-circuited transmission line technique was used. Complex magnetic susceptibility measurements of magnetic fluids are presented as a function of both frequency and external polarising magnetic field in ranges from 60 MHz to 6 GHz and from 0 Oe to 1212 Oe, respectively. Resonance frequencies in the range from 2.09 GHz to 5.06 GHz and maximum frequencies in the range from 1.19 GHz to 4.68 GHz as a function of the bias polarising field were measured for the magnetic fluid. From resonance measurements for different polarising fields, a mean anisotropy field value of _A= 767Oe was obtained. Also a mean value of anisotropy constant = 12.2x10⁴erg/cm³ and gyromagnetic ratio γ = 16.07 x 10⁶ 1/sOe were determined.

Keywords: ferro-resonance; magnetic fluids; magnetic susceptibility; oleic acid; kerosene; resonance frequencies; polarising magnetic fields; magnetite nanoparticles; nanotechnology.

DOI: 10.1504/IJMPT.2006.010677

International Journal of Materials and Product Technology, 2006 Vol.27 No.1/2, pp.110 - 115

Published online: 16 Aug 2006 *

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