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Neodymium Magnet Basic Knowledge
Nov 07, 2016

Inreversible Temperature Coeffficients: Take 20°C and 120°C as example,

α(Br)=(12.07-13.39)÷13.39/(120°C-20°C)x100%

Remanence=Br

Coercive Force= Hcb

Instrinsic Coercive Force=Hcj

Maximum Specific Energy Product=BH(max)

 

Curie Temperature:

The Curie-Weiss Law is an adapted version of Curie's Law.
The Curie-Weiss Law is a simple model derived from a mean-field approximation, this means it works well for the materials temperature,T, much greater than their corresponding Curie Temperature,Tc, i.e. T  >>   Tc; however fails to describe the magnetic susceptibility, χ, in the immediate vicinity of the Curie point because of local fluctuations between atoms.
Both Curie's Law and the Curie-Weiss Law do not hold for   T <   Tc.
Curie's Law for a paramagnetic material;


Definition
χthe magnetic susceptibility; the influence of an applied magnetic field on a material
Mthe magnetic moments per unit volume
Hthe macroscopic magnetic field
Bthe magnetic field
Cthe material-specific Curie constant


µ0the permeability of free space. Note - in CGS units is taken to equal one.[24]
gthe Landé g-factor
J(J+1)the eigenvalue for eigenstate J2 for the stationary states within the incomplete atoms shells (electrons unpaired)
µBthe Bohr Magneton
kBBoltzmann's constant
total magnetismis N number of magnetic moments per unit volume
The Curie-Weiss Law is then derived from Curie's Law to be
where
λ is the Weiss molecular field constant.


Curie Temperature of materials
MaterialCurie Temperature (K)
Iron (Fe)1043
Cobalt (Co)1400
Nickel (Ni)631
Gadolinium (Gd)292
Dysprosium (Dy)88
MnBi630
MnSb587
CrO2386
MnAs318
EuO69
Iron(III) oxide (Fe2O3)948
Iron(II,III) oxide (FeOFe2O3)858
NiOFe2O3858
CuOFe2O3728
MgOFe2O3713
MnOFe2O3573
Y3Fe5O12560

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