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← ScienceWhich outcome occurs when ferromagnetic nanoparticles reach the Curie temperature?
A)Loss of spontaneous magnetization occurs✓
B)Increased mechanical hardness results
C)Electrical resistivity decreases linearly
D)Thermal expansion coefficient sharply increases
💡 Explanation
Above the Curie temperature, thermal energy disrupts the alignment of atomic magnetic moments; therefore it transitions to paramagnetic behavior because spontaneous magnetization is destroyed by the loss of long-range ordering rather than increased mechanical hardness.
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