What is NdFeB?

NdFeB, neo and Nd₂Fe₁₄B

NdFeB abbreviates neodymium, iron and boron. These permanent-magnet materials retain magnetization after the magnetizing field is removed. They are often called neodymium magnets, neo magnets or rare-earth magnets. Samarium cobalt is another rare-earth permanent-magnet family, so “rare earth” is a broader description than NdFeB.

Nd₂Fe₁₄B describes the principal hard-magnetic phase and its atomic ratio of two neodymium atoms to fourteen iron atoms to one boron atom. That ratio is not a statement that every finished magnet has exactly the same total composition or weight percentages. Actual materials can include other phases and additions; a bonded magnet also contains a binder.^[1]

Different material grades balance remanence, resistance to demagnetization and other properties. Manufacturer information may also distinguish processing technologies and orientation. A chemical name alone leaves those choices open.^[2]

Why NdFeB is used in compact magnetic systems

NdFeB can provide high magnetic energy density, making it useful in motors, actuators, sensors, couplings and holding assemblies where space matters. The useful output still depends on the component shape, magnetic circuit and temperature.

A permanent magnet does not need a continuous electrical supply to retain its magnetization, although the device around it may use electrical power. Its field and long-term performance are still affected by its environment, operating point, temperature and condition.

Keep three questions distinct: what properties the material has, what field the finished magnet produces at a particular location, and what the assembly actually does. TDK’s guide explicitly separates basic material measurements from product characteristics agreed with the customer.^[3]

Two broad material routes

A bonded system can be isotropic or anisotropic. Its density and performance depend on the particular compound; Magnequench’s material sheet and SDM’s orientation explanation show why the forming route and orientation should both be specified.^{[4] [5]}

See the sintered and bonded comparison before treating two parts with the same general material name as interchangeable.

What to decide for a useful inquiry

• Function: holding, a field at a sensor, torque transfer or another task.
• Geometry: dimensions and units, with mating parts and working gaps.
• Magnetization: direction, required pole location and any pattern.
• Material: specified grade or the conditions needed to discuss one.
• Environment: temperature, moisture, chemicals and mechanical loading.
• Supply and acceptance: quantity, samples, documents and the checks required.

Hard, brittle magnets require appropriate handling and retention. Their strong fields can also affect equipment and implanted medical devices. Read the handling guide when planning receipt or assembly.^[3]

If you have a drawing, send its revision and known requirements. If you are starting from an application, describe what the magnet must do and which constraints are fixed. Nike Industrial Trading can discuss the product and supply requirement with you.