Performance Curve – BH Demagnetization Curves

Br(kGs)
Hcj
(kOe)
10.5 11 11.5 12 12.5 12.9 13.2 13.5 13.8 14 14.2 14.5  Working Temp(℃)
(L/d=0.7)
35 28AH 30AH 33AH 35AH 38AH 40AH 230
30 28EH 30EH 33EH 35EH 38EH 40EH 42EH 45EH 200
25 30UH 33UH 35UH 38UH 40UH 42UH 45UH 48UH 50UH 180
20 30SH 33SH 35SH 38SH 40SH 42SH 45SH 48SH 50SH 52SH 150
17 30H 33H 35H 38H 40H 42H 45H 48H 50H 52H 120
14 30M 33M 35M 38M 40M 42M 45M 48M 50M 52M 100
12 N30 N33 N35 N38 N40 N42 N45 N48 N50 N52 N54 80
28 30 33 35 38 40 42 45 48 50 52 54 BHmax
(MGOe)

Performance Curve

Performance Curve

AlNiCo BH curve: 

Alnico alloys consist of aluminum, nickel, cobalt, copper, and iron. Some grades have titanium and some manufactures also use additions of silicon, columbium zirconium, or other elements to enhance the magnetic properties.

These alloys are formed by foundry processes as previously noted. The magnetic performance is developed by heat treating the castings. The heat treat process for most of the grade includes the application of a magnetic field to produce domain alignment.

Example of a SmCo BH curve: 

samarium cobalt magnets BH Curve

samarium cobalt magnets BH Curve

SmCo magnets will outperform NdFeB magnets at temperatures above +150 to +180 degrees C.
SmCo magnets can be used at cryogenic temperatures (i.e. towards absolute zero, -273 degrees C).
The magnet shape, its environment, and the actual application affect how the NdFeB magnet will perform. Temperature is important as well as damp or wet conditions.
When determining suitability, you should analyse the Intrinsic curve not the Normal curve.
By keeping the intrinsic working point above the ‘knee’ and ideally at the BHmax working point maximum performance is possible.
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