Mossbauer and XRD study of pulse plated Fe-P and Fe-Ni thin layers

摘要

Fe-57 conversion electron Mossbauer spectroscopy, X-ray diffraction, electrochemical and magnetic measurements were used to study pulse electroplated Fe-P and NiFe coatings. XRD and Fe-57 CEMS measurements revealed the amorphous character of the novel pulse plated Fe-P alloys. CEM spectra indicated significant differences in the short range order and in the magnetic anisotropy between the Fe-P deposits pulse plated at medium long deposition time (t(on) = 2 ms), with short relaxation time (t(off) = 9 ms) and low current density (I-p = 0.05 Acm(-2)) or at short deposition time (t(on) = I ms) with long relaxation time (t(off) = 250 ms) and high current density (I-p = 1.0 Acm(-2)). The broad peaks centred around the fee reflections in XRD of the pulse plated Ni-22 wt. Fe deposit reflected a microcrystalline Ni-Fe alloy with a very fine, 5-8 nm, grain size. The CEM spectrum of the pulse plated Ni-22 wt. Fe coating corresponded to a highly disordered solid solution alloy containing a minute amount of ferrihydrite. Extreme favourable soft magnetic properties were observed with these Ni-Fe and Fe-P pulse plated thin layers.