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How to Choose Permanent Magnet Materials

by Stanford Magnets

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
Maximum Working
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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