Macroscopic magnetism
Technical properties of magnetic materials

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D2081 V1 Article

Macroscopic magnetism
Technical properties of magnetic materials

Author : Olivier GEOFFROY

Review date: January 30, 2015 | Lire en français

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2. Macroscopic magnetism

We have just explained the situation of an isolated ferromagnetic sample, the crucial point being its decomposition into domains. We're now interested in the material's behavior law, i.e. the evolution of its mean polarization as a function of the applied field.

In the presence of an applied field Ha , the potential energy of a magnetic moment Mi is written :

Ezi=μ0
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