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.
