Abstract
Magnetic behavior of Fe51Co12Si16B8Mo5P8 metallic glass prepared by a melt spinning technique is studied by magnetic measurements and room temperature transmission Mössbauer spectrometry. Mössbauer spectra were evaluated by the Normos program using distributions of hyperfine magnetic fields, P(B). The resulting ribbons were inspected in the as-quenched state as well as after annealing at temperatures of 200-550 °C for 1 hour. In the low temperature region, i.e., below the onset of crystallization, structural relaxation phenomena were unveiled. The onset of crystallization as derived from DSC and from XRD measurements differs by ∼40 degrees. Traces of crystalline phases were observed by XRD after annealing at 525 °C while DSC gives Tx1 = 566 °C. Mössbauer spectrometry exhibits presence of crystallites only after annealing at 550 °C. Standard deviation and the mean hyperfine magnetic field values of P(B) distributions obtained from Mössbauer spectrometry monotonically increase with temperature of annealing. They are attributed to the modification in the short range order of Fe atoms environments.
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