Technical Glossary Magnetic permeability

[Magnetic permeability]

Magnetic permeability is the ease of passing through a material's magnetic flux (the ease of magnetization) . This is one of the standards of evaluating magnetic absorption in applications for electromagnetic wave absorption.
When a substance is placed in space where magnetism is acting (a magnetic field) , it more or less takes on magnetism and becomes a magnet. At this point, increasing the intensity of the magnetic field means that magnetic flux density in a substance (indicating intensity as a magnet) will increase since it is also proportional, though the rate of change in this event is called the magnetic permeability. When magnetic permeability is greater, magnetic flux density will increase. In other words, when the magnetic flux passing though a substance, increases, its intensity as a magnet increase.
Generally, specific magnetic permeability (ratio of the magnetic permeability of a substance and magnetic permeability of a vacuum) is used rather than magnetic permeability. Magnetic flux does not readily pass through a substance with a low specific magnetic permeability like aluminum and, since it penetrates through, magnetic absorption will decrease. In contrast, magnetic flux readily passes through a substance with a high specific magnetic permeability like ferrite, so magnetic absorption will increase.