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Temperature Dependency of the major permanent magnetic materials 

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Thermal Expansion coefficients of the magnets:
Thermal expansion anomalies appear near TC and phase transformation temperatures, as well as the spin reorientation temperature for Nd-Fe-B.  The thermal anomalies are shown mainly in the c-axis for RE-Co materials. The thermal anomaly behavior is related to the magnitude of spontaneous magnetization, crystal structure and modulus of elasticity.

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