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Hard Magnetic Materials. Soft Magnetic Materials. 1. Materials which retain their magnetism and are difficult to demagnetize are called hard magnetic materials. These materials retain their magnetism even after the removal of the applied magnetic field. Hence these materials are used for making permanent magnets.n permanent magnets the movement of the domain wall is prevented. They are prepared by heating the magnetic materials to the required temperature and then quenching them. Impurities increase the strength of hard magnetic materials. Soft magnetic materials are easy to magnetize and demagnetize.
The magnetism is a property of certain elements with certain geometry of their electron spin, such as iron. There is iron in minerals of basalt , the rock that comes from lava erupting along Mid ocean ridges. As these minerals cool, the magnetic domains (like subcrystalline regions that act like a magnetic dipole line up with the prevailing external magnetic field and get frozen in that alignment, becoming a property of all the