These materials span a range of properties that accommodate a wide variety of application requirements. The following is intended to give a broad but practical overview of factors that must be considered in selecting the proper material, grade, shape, and size of magnet for a specific application. The chart below shows typical values of the key characteristics for selected grades of various materials for comparison. These values will be discussed in detail in the following sections.

 

Table Magnet Material Comparisons

Material Grade Br Hc Hci BHmax Tmax (Deg C)*
NdFeB 39H 12,800 12,300 21,000 40 150
SmCo 26 10,500 9,200 10,000 26 300
NdFeB B10N 6,800 5,780 10,300 10 150
Alnico 5 12,500 640 640 5.5 540
Ceramic 8 3,900 3,200 3,250 3.5 300
Flexible 1 1,600 1,370 1,380 0.6 100

 

* Tmax (maximum practical operating temperature) is for reference only. The maximum practical operating temperature of any magnet is dependent on the circuit the magnet is operating in.