How to Make a Magnet Stronger

Magnets have a wide range of uses, from sticking things to your refrigerator, to picking up metallic objects, to keeping cabinet doors closed. Some magnets can get weaker over time and no longer serve their purpose. Others are too weak for what we want them for to begin with. Unfortunately, there isn't always a way to make a magnet stronger. However there are a few ways to make some types of magnets stronger. Here's how to make certain magnets stronger:

  • Iron bar magnets Fill a bowl or pan with some water. Find something that will float on the water. Lay the magnet on top of this object. The magnet will twirl in the water until it comes to rest pointing exactly north and south due to the magnetic force of the North Pole. Carefully take the magnet off the water and lay it on a hard (preferably wooden) surface in the exact same north-south position. Strike one end of the magnet hard with a hammer repeatedly. The force may loosen the tiny magnetic domains in the bar so they can point north like they are supposed to [source: Newton].
  • Magnets that have lost their strength Sometimes you can recharge a magnet that has lost some of its original charge. If you can find a very strong magnet, repeatedly rub it across your weakened magnet. The strong magnet will realign the magnetic domains inside the weakened magnet [source: Luminaltech].
  • Magnet stacking One way to make weak magnets stronger is by stacking more of them together. There's a big problem with this, though. Magnets attract each other in opposite directions, which will lower their overall strength. If you can find a way to hold or clamp them together, so they're aligned in the same direction, they will in fact produce a stronger magnetic field [source: Balbach].