4. Thermomagnetic effects
4.1 Fundamental principles
The entropy of a magnetic solid is the sum of two contributions:
a magnetic contribution due to directional disorder of magnetic moments ;
the contribution of thermal vibrations of the crystal lattice (phonons), explained simply as lattice contribution in the following, found in all solids.
By applying a magnetic induction B at constant temperature, we reduce the magnetic entropy SM in the same way as the entropy of a gas is reduced by isothermal compression.
In algebraic value, we have :
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Thermomagnetic effects
Conclusion for general refrigeration production
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