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ac susceptibility study of a magnetite magnetic fluid

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4 Author(s)
Ayala-Valenzuela, O.E. ; Centro de Investigación en Materiales Avanzados, S. C. (CIMAV), Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31109, Mexico ; Matutes-Aquino, J.A. ; Galindo, J.T.Elizalde ; Botez, C.E.

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Magnetite nanometric powder was synthesized from metal salts using a coprecipitation technique. The powders were used to produce magnetic fluid via a peptization method, with hydrocarbon Isopar M as liquid carrier and oleic acid as surfactant. The complex magnetic susceptibility χ=χ+iχ was measured as a function of temperature T in steps of 2.5 K from 3 to 298 K for frequencies ranging from f=10 to 10 000 Hz. The magnetic fluid real and imaginary components of the ac susceptibility show a prominent maximum at temperatures that increase with the measuring frequency, which is attributed to a spin-glass-like behavior. The peak temperature Tp1 of χ depends on f following the Vogel–Fulcher law f=f0exp[E/kB(Tp1-T0)], where f0 and E are positive constants and T0 is a parameter related to particle interactions. There is another kind of peak temperature, Tp2, in the loss factor tan δ=χ which is related to a magnetic aftereffect. The peak temperature Tp2 is far less than Tp1 and shows an Arrhenius-type dependence on f.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 7 )

Date of Publication:

Apr 2009

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