# Isotropic / anisotropic soft magnetic material: linear approximation

## Presentation

This model defines a linear B(H) dependence without taking into consideration the saturation phenomenon for an isotropic or anisotropic material. It can be utilized for fields of low values, as long as the saturation knee is not reached.

## Mathematical model

This model is a straight line .

The corresponding mathematical formula is written as follows:

Β(Η)=μ0μrΗ

where:

• μ0 is the permeability of vacuum, μ0 = 4 π 10-7 H/m
• μr is the relative permeability of the material

The shape of the B(H) dependence is given in the figure below.

## Anisotropic material

For an anisotropic material, this linear model consists of a group of three straight lines.