Permanent Magnet Materials Introduction
Permanent magnets are used in the following major groups: acoustic transducers, motors and generators, magneto mechanical devices, and magnetic field and imaging systems. You will find permanent magnets in many products, such as televisions, telephones, computers, audio systems and automobiles.
The permanent magnet family consists of non-rare earth permanent magnets and rare earth magnets. The non-rare earth magnets include Alnico magnets and Ceramic magnets. Rare earth magnets include Sm-Co magnets and NdFeB magnets (Neodymium-Iron-Boron).
Although non-rare earth magnets are used in the majority of these applications due to their economic cost, rare earth permanent magnets have many distinguishing characteristics, such as a large Maximum Energy Product, Two major families of rare earth permanent magnets, Sm-Co magnets and NdFeB magnets
.Parameter of Neodymium Magnets

Material		Magnetic properties
Item	Grade	Br		Hcj(Min)		Hcb((Min))		(BH)max Range		Work temp.
		T	kGs	kA/m	kOe	kA/m	kOe	kJ/m³	MGOe	ºC
1	N27	1.03-1.08	10.3-10.8	955	12	796	10	199-231	25-29	80
2	N30	1.08-1.13	10.8-11.3	955	12	796	10	223-247	28-31	80
3	N33	1.13-1.17	11.3-11.7	955	12	836	10.5	247-263	31-33	80
4	N35	1.17-1.22	11.7-12.2	955	12	868	10.9	263-287	33-36	80
5	N38	1.22-1.25	12.2-12.5	955	12	899	11.3	287-310	36-39	80
6	N40	1.25-1.28	12.5-12.8	955	12	923	11.6	302-326	38-41	80
7	N42	1.28-1.32	12.8-13.2	955	12	923	11.6	318-342	40-43	80
8	N45	1.32-1.38	13.2-13.8	955	12	876	11	342-366	43-46	80
9	N48	1.37-1.42	13.7-14.2	955	12	892	11.2	366-390	46-49	80
10	N50	1.39-1.44	13.9-14.4	876	11	836	10.5	374-406	47-51	80
11	N52	1.42-1.47	14.2-14.7	876	11	836	10.5	390-422	49-53	80
12	N55	1.46-1.52	14.6-15.2	876	11	716	9	414-446	52-56	80
13	30M	1.08-1.13	10.8-11.3	1114	14	796	10	223-247	28-31	100
14	33M	1.13-1.17	11.3-11.7	1114	14	836	10.5	247-263	31-33	100
15	35M	1.17-1.22	11.7-12.2	1114	14	868	10.9	263-287	33-36	100
16	38M	1.22-1.25	12.2-12.5	1114	14	899	11.3	287-310	36-39	100
17	40M	1.25-1.28	12.5-12.8	1114	14	923	11.6	302-326	38-41	100
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