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Magnet Glossary

Air Gap: A non-magnetic space between the poles of magnets in a magnetic circuit, no matter the space is filled with plastic parts or brass or other non-magnetic material.

AnisotropicThe material has preferred magnetized direction determined during the pressing process, it can’t be changed in the magnetizing process.

B/H CurveThe curve graphic generated from plotting the resultant flux density B against the magnetic field H , which represents the qualities of a magnet when magnetized and demagnetized.

Br, Residual InductionAlso called Residual Flux Density, measured in gauss or tesla. The magnetic induction remaining in a magnet compared to zero after it is saturated by the magnetizing field.

Coercive Force, HcThe value of demagnetizing force, as measured by Oersteds or kA/m, required to reduce the magnetization saturation to zero.

Curie Temperature: The temperature above which magnets become nonmagnetic, losing all magnetic properties.

Demagnetization Force: A magnetizing force, the opposite direction of the magnetic field of a magnet. Which removes magnetic properties from fully magnetized.

Ferrous Metal: Ferrous metals are often magnetic, but not exclusively. The material a source or conductor of magnetic flux, often contains element of iron or nickel.

Gaussmeter: An instrument that directly measures the strength of a magnetic field in gauss at any point.

Intrinsic Coercive Force, Hci: The value of resist demagnetization force, as measured by Oersteds or kA/m, shows how stable one magnet put in a demagnetizing space.

Isotropic: The material doesn’t have magnetized direction determined during the pressing process, thus magnetization through any direction is allowable.

Magnetic Induction: Flux per unit space range of a section normal to the direction of the magnetic path.

Magnetic Saturation: The maximum energy can be achieved that a magnet can put over another magnet.

Grade: The number indicates how strong of magnetic strength with a magnet, generally a higher number means a stronger magnet. For example, N54 magnet is much stronger than N35 magnet.

Maximum Energy Product, BHmax: The magnetic field yields when product of Bd and Hd at the point of maximum energy.

Orientation: Describes the optimum direction of magnetization of an anisotropic, which direction can obtain the magnet’s maximum magnetic properties.