Magnetic Glossary -magnetic glossary

Magnetic Glossary -magnetic glossary


What is a magnet?
A magnet is an object that is made of materials that create amagnetic field. Magnets have poles,Every magnet has at least onenorth pole and one south pole.

magnetic poles
The points, or poles, where their magnetic strength isconcentrated. We label them north and south because suspendedmagnets orient along north-south planes. On different magnets, likepoles repel each other, opposite poles attract.

magnetic field
A magnetic field is the region in space where a magnetic force canbe detected. The magnetic field strength and direction can bemeasured in terms of strength and direction.

Anisotropic (oriented)
The material has a preferred direction of magnetic orientation.

Isotropic (non-oriented)
The material has no preferred direction of magnetic orientation,which allows magnetization in any direction.

Residual Induction, Br
Flux density, measured in gauss, of a magnetic material after beingfully magnetized in a closed circuit.

Maximum Energy Product, BHmax
The maximum product of (BdHd) which can be obtained on thedemagnetization curve.

Maximum Operating Temperature
The maximum temperature of exposure that a magnet can foregowithout significant long-range instability or structural changes

Curie Temperature ,Tc
Temperature at which a material loses its magnetic properties

Gauss
Unit of measure of magnetic induction, B, or flux density in theCGS system.

Gaussmeter
instrument that measures the instantaneous value of magneticinduction, B. Its principle of operation is usually based on one ofthe following: the Hall effect, nuclear magnetic resonance (NMR),or the rotating coil principle.

Magnetic induction ,B
the Flux per unit area of a section normal to the direction of themagnetic path. Measured in gauss.
 

demagnetization curve
Also known as the BH Curve,It is the second (or fourth) quadrant ofa major hysteresis loop. Points on the normal curve are designatedby the coordinates Bd and Hd.Generally describing the behavior ofmagnetic characteristics in actual use.MagneticFlux
The magnetic induction(B) over an area(A), when it is uniformlydistributed and is normal to the area.

 Keeper
A soft iron piece temporarily added between the poles of a magneticcircuit to protect it from demagnetizing influences. Also called ashunt. Not needed for Neodymium and other modern magnets.