Abstract
The paper presents an experimental study of magnetic properties of the LaFeCoSi alloy near the magnetic phase transition at the Curie temperature of 306 K. The biased magnetizing field complies with the real magnetization of active magnetic regenerators, whereas the standards for testing soft magnetic materials recommend the approach based on the bipolar magnetizing field. The influence of the DC-biased magnetic field on dynamic hysteresis loops and power losses was studied. The investigations confirmed a significant drop of power losses under biased magnetization and proved that the impact of the time of the magnetizing field switching between the isomagnetic states is critical, as far as the field distribution inside the sample and the magnitude of magnetic losses are concerned.
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