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How to Choose Permanent Magnet Materials 

Each permanent magnet material has its own properties and construction. How to choose the right one for specific applications is a challenge to all users. A balance between cost and performance must be considered in selecting of permanent magnet materials. Reference books may be helpful to you in designing and selecting permanent magnet materials. Following table shows a comparison of important parameters to help you select optimal permanent magnet materials for your applications.

Material	Cost Index	Maximum Energy Product (BH)max (MGOe)	Coercivity Hci (KOe)	Maximum Working Temperature (°C)	Machinability
NdFeB (sintered)	65%	up to 45	up to 30	180	Fair
NdFeB (bonded)	50%	up to 10	up to 11	150	Good
SmCo (sintered)	100%	up to 30	up to 25	350	Difficult
SmCo (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

Note: The data listed in the table are for reference only.
The temperature coefficient of remanence is inversely proportional to the maximum working temperature.

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