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 Terms & Definitions Core-Tech Soft Ferrite Materials Static Magnetization curves Relative Loss Factor Vs Frequency Inductance Change Vs Temperature
EMI (Electromagnetic Interference)
A useful definition of EMI noise is any signigicant signal energy that causes unintended, undesirable circuit function or inadequate EMC performance.

AC Initial Permeability (£giac)
This is the limit value of magnetic core permeability at the origin of the virgin magnetization curve. It's given by the following formula:

Inductance (L):
The magnetic flux linkages in Maxwells-turns per ampere of magnetizing current.

Inductance Factor (AL)
Inductance factor is defined as the self inductance per unit turn of a coil of a given shape and dimension wound on a magnetic core, and is determined by the following formula:

Quality Factor (Q):
The efficiency of an inductor, that is the ratio of series inductive reactance to loss resistance.

Loss factor (tan£_):
Deviation from ideal phase angle (90°) due to losses.

Relative Loss Factor (tan£_ /£giac)
Losses per unit of permeability. Figure merit of a material.

Curie Temperature (Tc):
emperature at which a ferromagnetic material loses its ferromagnetism and becomes paramagnetic(£g approaches 1)

Relative Temperature Coefficient of lnitial permeability (£\£gr):
This is the value obtained by dividing the temperature coefficient of the initial permeability(£\£g) by the initial permeability.

Specific Gravity (d)
It's calculated from its volume and weight, as shown below:

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