Magnetic Nanoparticles: Preparation and Properties
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Magnetic particles are well known for their use in recording devices. For such an application that involves information storage, the nature, size, and shape of the particles are important parameters. These particles are usually made of magnetite (Fe3O4), maghemite (γ-Fe2O3), cobalt ferrite (Fe2CoO4), or chromium dioxide (CrO2). They are spherical or acicular, and are usually micron-sized. These particles are deposited on a substrate, and only magnetic properties of the systems are considered.
In this entry, we shall not focus on magnetic particles as magnetic pigments, but as special colloids. Indeed, we shall describe the synthesis and properties of particles whose diameters are smaller than 15 nm, and thus are subject to Brownian motion.