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Encyclopedia > Coercivity

In material science, the Coercivity of a ferromagnetic material is the intensity of the magnetic field required to reduce the magnetization of that material to zero after the magnetization of the sample has reached saturation. A ferromagnet is a piece of ferromagnetic material, in which the microscopic magnetized regions, called domains, have been aligned by an external magnetic field (e. ... Current flowing through a wire produces a magnetic field (M) around the wire. ... For magnetic materials, saturation is the state when the material can not absorb a stronger magnetic field, such that an increase of magnetization produces no significant change in magnetic flux density. ...


  Results from FactBites:
 
AIM - The global trade assocation for automatic identification (3209 words)
The trend is to move towards higher coercivity with values of 2100, 2750, 3600 and 4000 Oersteds being common.
High coercivity magnetic stripes bring a new collection of parameters to the magnetic stripe world and higher is not always better.
Coercivity is NOT a measure of signal amplitude.
Permanent Magnets (571 words)
The desirable properties of such magnets are typically stated in terms of the remanence and coercivity of the magnet materials.
Both the coercivity and remanence are quoted in Tesla, the basic unit for magnetic field B.
The materials with high remanence and high coercivity from which permanent magnets are made are sometimes said to be "magnetically hard" to contrast them with the "magnetically soft" materials from which transformer cores and coils for electronics are made.
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