Superparamagnetism is a form of magnetism, which appears in small ferromagnetic or ferrimagnetic nanoparticles. In sufficiently small nanoparticles, magnetization can randomly flip direction under the influence of temperature. The typical time between two flips is called the Néel relaxation time. In the absence of an external magnetic field, when...
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http://en.wikipedia.org/wiki/Superparamagnetism
(from the article `nanotechnology`) ...with a single `giant` spin. For example, the giant spin of a ferromagnetic iron particle rotates freely at room temperature for diameters below ... Superparamagnetism occurs in materials having grains so small (about 100 angstroms) that any cooperative alignment of dipole moments is overc...
Found on
http://www.britannica.com/eb/a-z/s/188
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