Typical Magnets

Rare Earth

Ferrite

Alinico

Others

B-H CURVE OF TYPICAL MAGNETS Magnetic characteristics and their physical characteristics

Each magnet has a characteristic shape due to its materialistic physical features. Rare earth magnets; This newcomer to the magnet industry with its high performance of both residual flux density and coercive force superior to all other magnets, allows for its very compact and thin design. Alnico Magnets; The most established and widely used magnets. Because of the low coercive force and high flux density, the material needs distance between N and S pole, therefore the shape employs a long and thin design. Usable at a high temperature due to a low temperature coefficient. Ferrite magnets; The feature of a relatively low residual flux density, coupled with a high coercive force makes material shape flat. Because of high availability of material, the economical cost is attractive to the magnet designers. MA magnets; Since the physical property is located between Alnico and Ferrite magnets, MA magnets features both characteristics and employs a thick and short shape.

Standard Rating Characteristics of Representative Magnets

Type of magnets		Rare Earth		Ferrite			Alnico Magnet
Item	Unit	Nd-Fe-b	Sm-Co	Isotropic Ba-Ferrite	Anisotropic Sr-Ferrite by Dry	Anisotropic sr-Ferrite by wet	Alnico-5	Alnico-8	Haimag Alnico-5 col
Brr	[ kG ]	12.4	10.5	2.2	3.6	4	12.7	8.8	13.5
	( mT )	1,240	1,050	220	360	400	1,270	880	1,350
bHc	[ kOe ]	11.6	8	1.9	3	3.3	0.65	1.47	0.75
	( kA/m )	923	636	151	238	262	51	117	59
Bhmax	[ MGOe ]	37	24	1	3	3.8	5.3	5.2	7.3
	( kJ/ÜG)	294.5	191	8	23.9	30.2	42.2	41.4	58.1
Temperature characteristic of Br	%/Åé	-0.12	-0.04	-0.18	-0.18	-0.18	-0.02	-0.01	-0.02
Curie point	°C	320	750	460	460	460	850	850	850
Density	g/cÜG	7.4	8.3	4.8	4.8	4.9	7.3	7.3	7.3

( ) indicates SI unit system and [ ] indicates CGS unit system

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