Why Do Some Magnets Lose Their Power Over Time and Why Are Old Horseshoe Magnets Weaker?
Newer magnets are made of materials that are far less likely to lose their magnetism over time than the old horseshoe magnets. Magnets are composed of many little magnetic regions called domains. The magnetic field of the whole magnet runs opposite to the direction of the domains that cause the field. That tends to make the doma
