Modern data processing systems use thousands of magnetic cores. These cores are small and consume less power than most of the other devices that used in these systems.

You'll also find magnetic cores in automatic equipment employed for communication, fire control, cryptography and high speed commutation. What are magnetic cores?

This film uncovers principles of magnetic cores, physical processes in magnetic materials and how binary "0" or "1" can be stored by virtue of magnetism. It demonstrates where hysteresis come from, and, how residual magnetism takes place in magnetic loop.

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A piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices (such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies) is called a magnetic core. It is made of ferromagnetic metal such as iron, or ferrimagnetic compounds such as ferrites. The high permeability, relative to the surrounding air, causes the magnetic field lines to be concentrated in the core material. The magnetic field is often created by a current-carrying coil of wire around the core.

The use of a magnetic core can increase the strength of magnetic field in an electromagnetic coil by a factor of several hundred times what it would be without the core. However, magnetic cores have side effects which must be taken to consideration. In alternating current (AC) devices they cause energy losses, called core losses, due to hysteresis and eddy currents in applications such as transformers and inductors. "Soft" magnetic materials with low coercivity and hysteresis, such as silicon steel, or ferrite, are usually used in cores.

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The Unites States Army
Department of Defense
1962

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