Which of the following substances is useful f | vedclass

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(A) Substances that show permanent magnetism are called ferromagnetic substances. $Fe_3O_4$ (magnetite) is a well-known ferromagnetic substance used i

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$Fe_3O_4$

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(A) Substances that show permanent magnetism are called ferromagnetic substances. $Fe_3O_4$ (magnetite) is a well-known ferromagnetic substance used in making permanent magnets. $MnO$ is antiferromagnetic,while $Gd$ (Gadolinium) is ferromagnetic but $Fe_3O_4$ is the standard textbook example for permanent magnets.

Which of the following substances is useful for making permanent magnets?

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