Physics of superparamagnetism
Ferrofluids - Superparamagnetic nanoparticles
Article REF: N4590 V1
Physics of superparamagnetism
Ferrofluids - Superparamagnetic nanoparticles

Authors : Irena MILOSEVIC, Laurence MOTTE, Frédéric MAZALEYRAT

Publication date: April 10, 2011 | Lire en français

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1. Physics of superparamagnetism

1.1 Definitions

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1.1.1 Polarization and magnetic moment

Magnetic polarization, J (in T), is a measure of the sum of atomic moments per unit volume with respect to a quantization axis. When all the moments are aligned in the same direction, particularly under the action of a strong magnetic excitation field H (A · m –1 ), the material is saturated and J = J S .

Polarization is equivalent to magnetization,...

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