The study of magnetite nanoparticles is particularly interesting
because of their wide variety of technological applications in fields
like recording devices, where the grains must be small and
magnetically decoupled [1–4]; medicines supported by specific
polymers [5–7]; pigments [8]; and biotechnology [9], they are also
useful as a raw material in the synthesis of maghemite [10].
Recently, magnetite ferrofluids have become very attractive
materials because they can be directed by the action of the
magnetic field; they absorb electromagnetic energy with heat
evolution and their physical properties may change with the
application of a magnetic field [11,12].