Magnetic Alloys and Intermetallics

Material Matters Volume 2 Article 4

Magnetic alloys and intermetallics are metallic materials capable of producing a constant magnetic field for a prolonged period of time. There are only a limited number of chemical elements that can produce alloys with permanent magnetic properties at ambient temperature; Fe, Ni, Co and rare earth metals are the most important ones.

The magnetic materials offered by Sigma-Aldrich are capable of producing a high magnetic field with a low mass. They are also fairly stable against influences to demagnetize them. Major properties of our materials are described by the parameters shown below.

Maximum Energy Product, B(H)max: The point on the demagnetization curve where the product of Magnetic Induction (B) and Magnetic Field Strength (H), reaches a maximum and the volume of magnetic material required to project a given energy is minimum.

Residual Induction, Br: The point at which the hysteresis loop crosses the B axis at zero magnetizing force and represents the maximum magnetic flux output from the given material.

Coercive Force, Hc: The demagnetizing force necessary to reduce observed induction, B, to zero after the magnet has previously been brought to saturation.

Maximum Operation Temperature: Maximum temperature at which magnetic materials still retain their magnetic properties.

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