Abstract
The influence of microstructure on magnetic behavior in nanocrystalline Fe 80.5Nb 7B 12.5 alloys is investigated in a series of specimens with different volume fractions of crystalline phase. The magnetic behavior is studied by VSM magnetometry and by hysteresis loop measurements. A marked increase of Curie temperature of the residual amorphous matrix is observed with increasing volume fraction of BCC Fe nanocrystals. An abrupt deterioration of the soft magnetic behavior takes place at the beginning of the crystallization process. The minimum value of coercivity is found after annealing of specimens in the temperature range 610–630°C, i.e. just before the onset of the crystallization of the residual amorphous matrix.
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