Magnetic Glossary-magnetic glossary
What is a magnet?
A magnet is an object that is made of materials that createamagnetic field. Magnets have poles,Every magnet has at leastonenorth 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 alongnorth-south planes. On different magnets, likepoles repel eachother, opposite poles attract.
magnetic field
A magnetic field is the region in space where a magnetic forcecanbe detected. The magnetic field strength and direction canbemeasured 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 magneticorientation,which allows magnetization in any direction.
Residual Induction, Br
Flux density, measured in gauss, of a magnetic material afterbeingfully magnetized in a closed circuit.
Maximum Energy Product, BHmax
The maximum product of (BdHd) which can be obtained onthedemagnetization curve.
Maximum Operating Temperature
The maximum temperature of exposure that a magnet can foregowithoutsignificant 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 theCGSsystem.
Gaussmeter
instrument that measures the instantaneous value ofmagneticinduction, B. Its principle of operation is usually basedon 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 ofthemagnetic path. Measured in gauss.
demagnetization curve
Also known as the BH Curve,It is the second (or fourth) quadrantofa major hysteresis loop. Points on the normal curve aredesignatedby the coordinates Bd and Hd.Generally describing thebehavior ofmagnetic characteristics in actualuse.MagneticFlux
The magnetic induction(B) over an area(A), when it isuniformlydistributed and is normal to the area.
Keeper
A soft iron piece temporarily added between the poles of amagneticcircuit to protect it from demagnetizing influences. Alsocalled ashunt. Not needed for Neodymium and other modernmagnets.