Open AccessMössbauer Spectroscopy of Fe-Ni-Nb-B Alloy in Weak Magnetic Field
Author(s) -
J. Sitek,
Jarmila Degmová,
Katarína Sedlačková,
Július Dekan
Publication year - 2012
Publication title -
journal of modern physics
Language(s) - English
Resource type - Journals
eISSN - 2153-120X
pISSN - 2153-1196
DOI - 10.4236/jmp.2012.33038
Subject(s) - nanocrystalline material , materials science , paramagnetism , amorphous solid , condensed matter physics , magnetic field , ferromagnetism , mössbauer spectroscopy , magnetization , amorphous metal , alloy , magnetic moment , magnetic shape memory alloy , analytical chemistry (journal) , nuclear magnetic resonance , magnetic domain , crystallography , metallurgy , physics , chemistry , nanotechnology , quantum mechanics , chromatography
Amorphous and nanocrystalline (Fe1–xNix)81Nb7B12 (x = 0, 0.25, 0.5, 0.75) alloys were measured by Mössbauer spectrometry in the weak external magnetic field of 0.5 T. From structural analyses, ferromagnetic bcc-FeNi and fcc-FeNi and paramagnetic (Fe-Ni)23B6 phases were identified in the annealed samples. It was shown that in the external magnetic field the intensities of the 2nd and the 5th lines (A23 parameter) are the most sensitive Mössbauer parameters. Rather small changes were observed in the values of internal magnetic field. Our results showed that the amorphous precursor is more sensitive to the influence of external magnetic field than the nanocrystalline alloy. All spectra of amorphous precursor showed the increase of A23 parameter and decrease of internal magnetic field values of about 1 T (±0.5 T) under influence of external magnetic field. In the case of nanocrystalline samples the tendency for the values of internal magnetic field is similar but the effect is not so pronounced. The measurements confirmed that even weak external magnetic field affected orientation of the net magnetic moments. Our results indicate that effect of the external magnetic field is stronger in the case of amorphous samples due to their disordered structure