How to Choose Permanent Magnet Materials Each permanent magnet material discussed above has its ownprosand cons. How to choose the right one for yourparticularapplication is a challenge to any user. A balance betweencost andperformance must be considered in selecting of permanentmagnetmaterial. In Reference Information section of this page,severalreference books are listed. These books may be helpful toyou indesigning and selecting permanent magnet materials. Followingis aComparison Table to help you select a right permanentmagnetmaterial for your applications.
Permanent Magnet Material Comparison Table
Note: The data listed in the table are for reference only
| Material | Cost Index | Maximum EnergyProducts
(BH)max (MGOe) | Coercivity
Hci (KOe) | MaximumWorking
Temperature (°C) | Machinability |
| Nd-Fe-B (sintered) | 65% | Up to 45 | Up to 30 | 180 | Fair |
| Nd-Fe-B (bonded) | 50% | Up to 10 | Up to 11 | 150 | Good |
| Sm-Co (sintered) | 100% | Up to 30 | Up to 25 | 350 | Difficult |
| Sm-Co (bonded) | 85% | Up to 12 | Up to 10 | 150 | Fair |
| Alnico | 30% | Up to 10 | Up to 2 | 550 | Difficult |
| Hard Ferrite | 5% | Up to 4 | Up to 3 | 300 | Fair |
| Flexible | 2% | Up to 2 | Up to 3 | 100 | Excellent |