TYPICAL PROPERTIES OF THE VARIOUS MAGNET MATERIALS
Magnet Material Cost Temperature
Coeff. Br. 		Max. temp. Corrosion
Resistance		 Magnetic
Properties
FERRITE Low -0.19%/C. 250 degr.C. Excellent Low
ALNICO Medium -0.02%/C. 500 degr.C. Fair Medium
SmCo5 High -0.04%/C. 250 degr.C. Excellent High
Sm2Co17 High -0.03%/C. 300 degr.C. Excellent High
NdFeB Medium High -0.12%/C. 125 degr.C. Poor Very high


CONVERSION OF UNITS
SI unit c.g.s. units
1T=1Wb/m2=1Vs/m2
1mT
1A/m
1k/Am
1Wb = 1Vs = 1Tm2
1 µ Wb
µ 0=4Łk x10-7 H/m=1.257mTm/kA
1H/m = 1Vs/Am
1J/m³= 1TA/m
1kJ/m³=fmj/cm³
1J=1Ws=1N/m
1N=1kgm/s2=0.1019kilogramme force 		=10-4G=10kG
=10G
=4Łk x10-3Oe=0.01257Oe
=4Łk Oe=12.57Oe
=10&sup8;Mx
=100Mx
µ 0 can be replaced by 1G/Oe

=4Łk x10GOe=125.7GOe
=4Łk x10-2MGOe=0.1257MGOe
=107 erg
=105 dynes
SI unit c.g.s. units
10-4=0.1mT
0.1T=100mT
10³/(4Łk )A/m-1/(4Łk)kA/m=0.07985kA/m
0.01 µ Wb
10 µ Wb
10²(4Łk)mJ/m³=7.958mJ/m³
10²(4Łk)kJ/m³=7.958kJ/m³
10-7J
Energy in the field, external to the magnetic material, per unit volume of the permannent magnet. SI system: BH/2 		=1G(gauss)
=1kG
=1Oe<(oersted)
=1Mx(maxwell)
=1000Mx
=1GOe
=1MGOe
=1erg
Energy in the field, external to the magnetic material, per unit volume of the permannent magnet. c.g.s. : BH/8Łk


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