Anyone who’s worked with tiny screws knows how convenient a screwdriver with a magnetized tip can be. With this magnetizer, you can magnetize (or demagnetize) your own screwdrivers.
This tool takes advantage of the magnetic moment. Think of each atom in the object as a tiny magnet with a north and south pole caused by the position of its electrons. Unmagnetized, all of these atoms are in random directions, neutralizing their individual magnetic forces. But whenever they are exposed to a strong enough magnetic field, the atoms begin to align with the field and remain in that orientation. Their cumulative forces are amplified with each pass through the field and the object becomes magnetic. Interestingly, the process can also be achieved by striking the object while in a magnetic field, jarring the atoms into alignment.
Because the object is only paramagnetic—meaning it will respond to a magnetic field—the magnetism produced will eventually return to normal and you’ll have to re-magnetize it.
The demagnetizer works in exactly the opposite way by exposing the object to an irregular magnetic field. This effectively re- scrambles the atoms to neutralize their magnetic forces.