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.
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.
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.
Saturated magnets are completely magnetized. Meaning that you could not add more magnetic force if you try.
Ferromagnetic metals will be attracted, such as iron, nickel, cobalt and gadolinium, including materials that contain these elements such as steel.
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.
Magnets poles (north and south) are the opposite surfaces of the magnet from which the invisible lines of magnetic flux connect..
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.
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.
The strongest type of magnets available for commercial use is the neodymium magnets, and the strongest grade is the N55 grade neodymium.
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.
No, both have the same strength.
The Curie temperature of a magnet is the temperature above which it becomes completely demagnetize.
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.