Ferrite magnet
AIMANTS ARELEC

FERRAM is the name of ARELEC's ferrite magnets. It is a crystalline compound of Iron, Oxygen and Strontium. This family provides the most economical magnetic energy, which is why it is so widely used. It is mainly used for applications in which there are no thermal or dimensional constraints.

Utilisation

Ferrams have a number of uses, of which a summary is provided below.

- when associated with pole-pieces, they constitute attraction components.
- bare or potted, they can attract small objects and they have good distance attraction properties: toys, magnetic drawing pins, schedules. Thin strike plates are not sufficient.

For electrotechnical applications, they are used in vibrators, they control reed switches or Hall effect sensors, they operate thermostats, etc.

When overall size is not too tightly limited, Ferrams provide the most cost-effective solution to a magnetic problem.

This material is oriented, pressed and then sintered at high temperature. Its magnetisation is therefore always carried out in a privileged direction (anisotropic direction).

Mechanical properties

These materials belong to the ceramics family.
They are extremely hard and brittle, which means they are fragile with respect to impacts.
Ferrites are unaffected by most chemicals, except strong acids.

Magnetic properties

Ferrams have a moderate remanent induction and a high resistance to demagnetisation.