Critical magnetic properties of the re-entrant amorphous ferromagnet Ni80-xFexB12Si8
- 1 March 1988
- journal article
- Published by IOP Publishing in Journal of Physics F: Metal Physics
- Vol. 18 (3) , 553-561
- https://doi.org/10.1088/0305-4608/18/3/024
Abstract
The critical magnetic properties of the amorphous Ni-Fe-B-Si system have been studied using AC susceptibility techniques. Alloys of the composition Ni80-xFexB12Si8 with x>or=5 show re-entrant ferromagnetic behaviour. The critical exponents gamma , associated with the magnetic susceptibility, and delta , associated with the critical isotherm, have been determined. Values of the exponents are consistent with those predicted for three-dimensional Heisenberg systems. The critical susceptibility of the alloy with x=4 in the region above the spin-glass transition is found to follow a power law with an exponent gamma '0=1.5.Keywords
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