Neodymium-Iron-Boron Magnets

Sintered neodymium-iron-boron (NdFeB) magnets, also widely referred to as “neo” magnets, have be commercially available since 1984. They offer the highest energy product of any material today and are available in a very wide range of shapes, sizes and grades. The applications include voice coil motors (VCM’s) in hard disk drives, auto motors, Hi-Fi system, high performance motors, brushless DC motors, magnetic separation, MRI, sensors and other magnetic tools.

Maximum Working Temperature

Although the Curie temperature for NdFeB material is about 310 ºC for 0% cobalt material to greater than 370 ºC for 5% cobalt, some irreversible loss of output may be expected at even moderate temperatures. Neo magnets also have a moderately high Reversible Temperature Coefficient of Induction which reduces total magnetic output as temperature rises. Selection of neo magnets instead of SmCo, is a function of the maximum temperature of the application, required magnetic output at typical working temperature and total cost of the system.

Neo magnets also have some limitations due to their corrosion behavior. In humid circumstance, a protective coating or plating is highly recommended. Coatings which have been applied successfully include; e-coating, powder coating, nickel plating, zinc plating, parylene and combinations of these coatings.

Request Further Information

Please contact us for the detail information regarding to the following aspects.

1) Surface coating specification
2) Dimension and tolerance
3) Magnetization pattern
4) Magnetic Circuit Design