Why do amorphous nanocrystalline magnetic cores need to be heat treated

Amorphous and nanocrystalline strips themselves are cooled down by rapid cooling, so that the strips will generate stress due to structural imbalance. The magnetic properties of amorphous and nanocrystalline strips are very sensitive to stress, so they must be removed by heat treatment. The stress inside the material improves the magnetic properties of the material.

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