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Autori: Fausto Fiorillo1, Cinzia Beatrice1, Oriano Bottauscio1, and Eros Patroi2
Editorial: IEEE TRANSACTIONS ON MAGNETICS,, VOL. 43, NO. 7, JULY 2007, p.3159-3164, 2007.
We discuss a comprehensive approach to the characterization of permanent magnets with the pulsed field magnetometer. The approach
is based on a systematic comparison of the results obtained by this method with those from the conventional closed-circuit and
open-sample methods and on the assessment of the dynamic phenomena engendered by the application of the fast exciting field pulse.
Such phenomena derive from the thermal fluctuation aftereffect and the eddy currents, whose contributions to hysteresis loop swelling are
brought to light and separately evaluated.We show that the quasi-static hysteresis loop can be retrieved from the dynamically obtained
one by compensating for the magnetic viscosity field, found to be proportional to the coercive field, and the eddy-current counterfield. A
simple analytical formulation accounts for and predicts the effect of the counterfield.
Cuvinte cheie: cicluri de histerzis magnetic, masuratori magnetice, magneti permanenti, magnetometru cu camp in impuls // Magnetic hysteresis loop, magnetic measurements, permanent magnets, pulsed field magnetometer.