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The influence of Al doping on microstructure and hyperfine interactions in FINEMET

Brzózka K., Szumiata T., Gawroński M., Górka B., Zorkovská A., Sovák P.

Nukleonika

2004

Vol. 49,suppl.3

59-62

Structure and hyperfine interactions of amorphous and nanocrystalline FINEMET were investigated by means of Mössbauer spectrometry. It was found that substitution of x iron atoms with aluminum ones causes changes in the properties of both amorphous and nanocrystalline alloys as well as in the structure of individual phases. The reduction of hyperfine magnetic field caused by atom substitution is a non-linear function of x, unlike the linear dependence expected because of dilution. Temperature studies reveal a double magnetic phase transition at 250°C and 330°C as well as point to the variety of phases in the examined material.