info:eu-repo/semantics/article
Synthesis and complex magnetic susceptibility characterization of magnetic fluids in different liquid carriers
Autor
OSCAR EDUARDO AYALA VALENZUELA
JOSE ANDRES MATUTES AQUINO
REBECA BETANCOURT GALINDO
Resumen
Kerosene, isopar M, and mineral oil based magnetic fluids were prepared. The
magnetite nanoparticles have spherical shapes and a mean diameter of 10.2±3.2 nm.
The complex magnetic susceptibility X (ω) = X’ (ω) – iX’’ (ω) of the magnetic fluids was
measured using the transmission line technique applying dc magnetic fields over the
range 0–1212 Oe over the frequency range 70 MHz–6 GHz, where resonance and
relaxation are present. The resonance frequency fres defined as the frecuency at which
X’ (ω) goes from positive to negative values ranges from 2.1 to 5.4 GHz. The maximum
frecuency fmax defined as the frecuency at which maximum absorption occurs in X’ (ω)
ranges from 1.2 to 4.8 GHz. Anisotropy fields values were also determined.
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