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The basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets. Ferromagnetism manifests itself in the fact that a small externally imposed magnetic field can cause the magnetic domains to align and reinforce with each other, so that the material is said to be magnetized.

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Variation of magnetic susceptibility of ferromagnetic substances with temperature

I have here a typical graph of the magnetic susceptibility against temperature for a ferromagnetic substance. I believe I have a general understanding on why there is a general decreasing trend with t …
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