COERCIVITY OF THE FIELD-ANNEALED NANOCRYSTALLINE FeCoNbB ALLOYS

Deep interest in the nanocrystalline Fe-Co-M-B-(Cu) materials (M = Zr, Nb, Hf, …), called also HITPERM, is caused by industrial demand of the soft magnetic materials offering large magnetic induction with sufficiently stable characteristics also at elevated temperatures. Such characteristics are of particular interest mostly for the high frequency and sensors applications. In this paper, we report on a beneficial effect of the external magnetic field applied during the heat treatment on the soft magnetic characteristics of the alloys (Fe1-xCox)81Nb7B B 12 with varying Fe/Co portion. Observed composition-dependent effects are discussed in the terms of the model of directional ordering.