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TAILORING OF MAGNETIC HYSTERESIS LOOP

Specific Hystereses loops for a Wide Range of Applications

The character of an inductor is determined by the shape of the hysteresis loop that is formed in the magnetic reversal process. It is described by the change of Induction B with which the magnet material reacts to changes in the driving Field H.

In an inductor, H is generally determined by the current impressed in a winding (H ~ N·I). The induction flux density B then works on the parameters of the components in accordance with the Law of Induction U~ ∂B/∂t , such as the output voltage in a transformer or the impedance (internal resistance) in a choke.

The parameters of a hysteresis loop are:

  • Saturation induction BS
  • Remanence induction BR
  • Coercitivity Hc
  • Permeability B/(µ0H), where B and H are amplitude values on the initial magnetization curve (µ0 = 1.257·10-6 (Vs)/(Am).

The type and the course of the magnetic reversal process is decisively determined by the direction and amount of magnetic anisotropies as well as by the magnetic reversal speed.

 

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Last update: 02.07.2012

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