μ_{i} 
A.C. Initial Permeability
μ_{i} is defined as the limited value of a ferrite
core at the origin of the curve of initial magnetization: 

μ_{a} 
Amplitude Permeability
similar with μ_{i},but magnetized by a large
amplitude sine field.


tanδ/μ_{i} 
Relative Loss Factor
loss at low induction level.


Pv 
Power Loss
loss at high flux density level. 

Bms 
Effective Saturation Magnetic Flux Density (mT) 

Brms 
Residual Magnetic Flux Density (mT) 

Hc 
Coercive Force (Oersteds) (A/m) 

αF 
Temperature Factor of Permeability


ηB 
Hysteresis Material Constant 

D_{F} 
Disaccommodation Factor 


T_{C} 
Curie Temperature
temperature at which a ferrite
loses its ferromagnetism 

ρ 


d 
Apparent density,
The Apparent density is defined as a weight per
unit volume.

A_{L}(nH) 
Inductance Factor
Inductance of a coil on a specified core divided
by the square of the number of turns. (Unless
otherwise specified the inductance test conditions
for the inductance factor are at flux density?10 gauss).
The summation of the magnetic path lengths of
each section of a magnetic circuit divided by the
corresponding magnetic area of the same section.
The summation of the magnetic path lengths of
each section of a magnetic circuit divided by the
square of the corresponding magnetic area of the same section.













