چکیده انگلیسی مقاله :
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 (g-Fe2O3),
cobalt ferrite (Fe2CoO4), or chromium dioxide (CrO2).
They are spherical or acicular, and are usually micronsized.[
1] 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..