|MLA Citation:||Bloomfield, Louis A. "Question 846"|
How Everything Works 17 Jul 2018. 17 Jul 2018 <http://howeverythingworks.org/print1.php?QNum=846>.
Second, the materials used in permanent magnets have internal structures that make the magnetic electrons align along particular directions. Once the electrons are aligned along one of those directions, they stay aligned and the material exhibits strong magnetic characteristics. It becomes a "permanent magnet."
A permanent magnet remains its magnetization as long as nothing spoils the alignments of its magnetic electrons. These electrons can be knocked out of alignment by vibrations, heat, or other magnets. If you hit a permanent magnet with a hammer or heat it in the oven, you will change and perhaps destroy its magnetization. This magnetization can be recovered by exposing the permanent magnet to the magnetic influences of an electric current. In fact, permanent magnets are originally magnetized by placing them near electric currents that align their magnetic electrons. Moreover, even a material that doesn't have the internal structures needed to keep its electrons aligned along a particular direction will become magnetized temporarily by placing it near an electric current. That's how a wrecking yard magnet works-an electric current temporarily turns a large piece of iron into a strong magnet.