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Isotropic:
A magnet material whose magnetic properties are the same in any direction, and which can therefore be magnetized in any direction without loss of magnetic characteristics.


Anisotropic: (a.k.a Magnetically Oriented)
The material has a predefined direction of magnetic orientation

Coercive Force: Hcb
The magnetic field H which must be applied to a magnetic material in a symmetrical, cyclicly magnetized fashion, to make the magnetic induction B vanish.

Curie Temperature: TC
Temperature at which a material loses its magnetic properties.

Gauss: G
Unit of magnetic induction in the electromagnetic and Gaussian systems of units, equal to 1 maxwell per square centimeter.

Hardness: HRB
A measure of the resistance of a material to surface indentation or abrasion.

Intrinsic Coercive Force: Hcj
A measure of the material inherent ability to resist demagnetization.

Magnetic Flux:
The total magnetic induction over a given area. When the magnetic induction, B, is uniformly distributed over an area A, Magnetic Flux = BA.

Magnetic Induction: B (a.k.a Magnetic Flux Density)
Flux per unit area of a section normal to the direction of the magnetic path. Measured in gauss.

Maximum Energy Product: BHmax
The point on the Demagnetization Curve where the product of B and H is a maximum and the required volume of magnet material required to project a given energy into its surroundings is a minimum.

Maximum Operating Temperature: Tmax
The maximum temperature of exposure that a magnet can forego without significant long-range instability or structural changes.

Recoil Permeability: µr
The ratio of change in flux density as a function of incremental change in applied field (H) in the vicinity of H=0. It has no dimensions in either the MKSA or CGS system.

Residual Induction: Br (a.k.a residual flux density; residual magnetic induction; residual magnetism)
The magnetic flux density at which the magnetizing force is zero when the material is in a symmetrically and cyclically magnetized condition.

Temperature Coefficient:
The rate of change in magnetic property with respect to temperature. Expressed as percent change per unit of temperature.