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Glossary - F |
FEM and FEA
Ferrimagnetism
Ferrite, hard
Ferrite, soft
Ferromagnetism
Field lines
Flux density (B)
Flux leakage
Fluxmeter
FEM and FEA
Finite Element Model and Finite Element Analysis. Computer aided calculation for each type of vector and scalar field.
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Ferrimagnetism
Type of magnetic structure in which magnetic moments of different elements are aligned in anti-parallel way. If the elements have different moments, the net moment is not zero, and the material exhibits magnetic properties similar to a ferromagnet. Hard and soft ferrites are ferrimagnetic materials.
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Ferrite, hard
Compound with general chemical composition MO· 6Fe2O3, whereas M stands for metal element (generally, M = Ba or Sr). All hard ferrites have an hexagonal structures. The magnetic form could be isotropic or anisotropic. Hard ferrite is actually the most used magnetic material in the world, mainly for its low cost.
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Ferrite, soft
Compound with general chemical composition MO· Fe2O3, whereas M stands for metal element (generally, M = Cu-Zn, or Mg-Zn or Mn-Zn). Soft ferrites are used in high frequency applications (transformers, antennas, etc)
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Ferromagnetism
Type of magnetic structure in which magnetic moments are aligned in parallel way. Under the Curie temperature, moments align spontaneously, without need of external magnetic field. Practical magnetic materials, soft and hard, are all ferromagnetic materials.
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Field lines
It is a common way to visualise the magnetic field. The field in one point of one field line has the same direction of the line and intensity proportional to the density of the lines in that point.
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Flux density (B)
The same of magnetic induction (see).
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Flux leakage
The portion of the magnetic flux which does not pass through the air gap, or useful part of the magnetic circuit.
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Fluxmeter
Instrument to measure the magnetic flux linked with a measuring coil. The working principles of modern fluxmeters is the electronic integration of voltage induced in the coil by a change of flux.
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