How to Choose Permanent Magnet Materials

Each permanent magnet material discussed above has its own pros and cons. How to choose the right one for your particular application is a challenge to any user. A balance between cost and performance must be considered in selecting of permanent magnet material. In Reference Information section of this page, several reference books are listed. These books may be helpful to you in designing and selecting permanent magnet materials. Following is a Comparison Table to help you select a right permanent magnet material for your applications.

Permanent Magnet Material Comparison

TableNote: The data listed in the table are for reference only

Material	Cost Index	Maximum Energy Products (BH)max(MGOe)	Coercivity Hci(Koe)	Maximum Working 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

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