1. This results in the ferromagnetic material 's being magnetized, forming a permanent magnet. 2. The disc consists of a ferromagnetic material sealed beneath a plastic coating. 3. Thus coercivity measures the resistance of a ferromagnetic material to becoming demagnetized. 4. A relatively new class of exceptionally strong ferromagnetic materials are the rare-earth magnets. 5. Similar to ferromagnetic materials the magnetic interactions are held together by exchange interactions. 6. Metallic iron and the alloy alnico are examples of ferromagnetic materials involving transition metals. 7. The paramagnetic materials'induced magnetic fields are very weak in comparison to ferromagnetic materials 'magnetic fields. 8. The N�el temperature is analogous to the Curie temperature, T C, for ferromagnetic materials . 9. The armature may instead be made of ferromagnetic material , as in an electromagnetic solenoid. 10. Largely because of his work, manufacturing of ferromagnetic materials to virtually any specification became possible.
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