Do magnets lose their magnetic properties through time?

No, permanent magnets are not affected by time. But, they can lose their magnetic properties (non reversible) when exposed to heat (above working temperature), mechanical stress or stronger magnetic field.

How does heat affect magnets?

Permanent magnets magnetic characteristics decrease when exposed to heat. These loses are reversible and when the magnets return to room temperature, magnetic properties return to “normal”. All magnets characteristics are normalized to 20°. The effect of heat is different to each type of magnet and even different grades of the same type of magnet. For example neodymium magnets are more affected by heat then samarium cobalt magnets.

The information above is specifically about heat affect within the working temperatures. Exposing the magnets to temperatures above working temperature will cause irreversible losses of magnetic properties.

What is the pull force of a magnet through distance?

The strength of a magnetic field drops off exponentially over distance.The bigger the distance, the bigger the drop in pull force. The distance between the magnet and its objective is called “air gap” and it could be through any non magnetic material such as plastic, wood etc.

Can you re-magnetize a magnet?

Yes. You can magnetize magnets that have lost his magnetic properties as long as the magnet did not lose its inner particles alignment, as in case it was exposed to extreme heat.

What is a saturated magnet?

Saturated magnets are completely magnetized. Meaning that you could not add more magnetic force if you try.

What metals will magnets attract?

Ferromagnetic metals will be attracted, such as iron, nickel, cobalt and gadolinium, including materials that contain these elements such as steel.

How can you measure the power of a magnet?

We use gaussmeter, Magnetometers, or Pull-Testers in our magnetic laboratory. At home you can use small steel weights and use them to test the pulling strength of the magnet.

What are the magnets poles?

Magnets poles (north and south) are the opposite surfaces of the magnet from which the invisible lines of magnetic flux connect..

How can I find the north pole of the magnet?

The north pole could be located in different ways. If you have a magnet that it’s north pole is indicated, it will reject the north pole of your magnet. You can use a compass or a designated tool as well.

What are rare earth magnets?

Rare earth magnets are the neodymium iron boron magnets and samarium cobalt magnets. Neodymium and samarium are part of a group of elements that are called rare earth elements or rare earth metals and most of them (15 out of 17) are also called lanthanides.

What is the strongest type of magnets?

The strongest type of magnets available for commercial use is the neodymium magnets, and the strongest grade is the N55 grade neodymium.

Can I machine magnets?

Magnets can be machined. Hard magnet materials are difficult to machine. Magnets should be machined before magnetization as far as possible. Neodymium magnets should be machined before coating as well. In general, it is best to order the magnets in their final shape and avoid machining by yourself.

Is the north pole stronger than the south pole?

No, both have the same strength.

What is the curie temperature of a magnet?

The Curie temperature of a magnet is the temperature above which it becomes completely demagnetize.

Can I order custom made magnets?

Yes. Most of the magnets we sell are custom made according to the customer requirements. You can order different shapes, sizes, grades etc. You can decide what finishing, plating, marking and more.

Interested in magnets or electromagnets? Need some more technical information or consultation? Team Magma will be happy to help you.