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Magnet Materials

Armstrong Magnetics makes, stocks and supplies magnet materials, they are:

Neodymium
Samarium Cobalt
Ceramic
Alnico
Bonded Neodymium
Custom Magnet Materials

We also provide Calculation Tools to determine Flux Density and Pull Force.

Permanent magnets have high coercive force and therefore keep their magnetic field stably under a proper application after they are magnetized.

In order to evaluate property of permanent magnets, we must take close attention to the following principal magnetic properties:

Br Residual induction (or flux density): The higher Br, the stronger magnetic field the permanent magnet has after magnetizing to saturation. Neodymium magnets have highest Br among all types of permanent magnets.

Hc Coercive force and Hci Intrinsic coercive force: The higher Hc and Hci, the stronger resistance of the permanent magnets to demagnetization. Rare earth magnets have highest Hc and Hci among all types of permanent magnets.

(BH)max Maximum Energy Product: It is the maximum energy that a permanent magnet can supply to an external magnetic circuit when operating in demagnization. The larger (BH)max, the more energy a permanent magnet can convert in energy conversion process as a reversible medium while it is still in stabilized condition. Rare earth magnets have highest (BH)max among all types of permanent magnets.

Tmax Maximum service temperature: The higher the Tmax, the higher temperature the permanent magnets can work stably at. Alnico magnets can work at highest temperature among all types of permanent magnets.

In order to roughly compare among different types of permanent magnets, take a glance at the following charts with different colors representing each permanent magnet.


         
Ceramic magnets Flexible magnets Neodymium magnets Samarium Cobalt magnets Alnico
magnets

Comparation of Permanent Magnets

         
           
               
               
               
                 
                   
                         
                               
                                   
     
Strength Resistance to
Demagnization		 Max. Service
Temperature		 Cost

For more information, click here.