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Ion irradiation induced structural modifications of Fe 81 Mo 8 Cu 1 B 10 NANOPERM‐type alloy
Author(s) -
Miglierini Marcel,
Hasiak Mariusz
Publication year - 2016
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532677
Subject(s) - materials science , amorphous solid , irradiation , ion , fluence , nitride , hyperfine structure , analytical chemistry (journal) , coercivity , alloy , magnetic hysteresis , mössbauer spectroscopy , crystallization , hysteresis , amorphous metal , crystallography , atomic physics , magnetization , condensed matter physics , chemistry , magnetic field , metallurgy , composite material , nuclear physics , physics , organic chemistry , chromatography , quantum mechanics , layer (electronics)
Structural modifications and their impact upon magnetic properties are studied in amorphous NANOPERM‐type 57 Fe 81 Mo 10 Cu 1 B 10 metallic glass exposed to irradiation with 130 keV N + ions to the total fluencies of up to 2.5 × 10 17 ions/cm 2 . Using surface sensitive technique of Mössbauer spectrometry, traces of crystalline phases are found already in the as‐quenched state after the sample production. On the air side of the ribbons, bcc‐Fe dominates whereas on the opposite wheel side, also a presence of Fe 3 O 4 is unveiled. The amount of surface crystallization is higher on the wheel side of the ribbons. After ion irradiation, mostly the air side is affected because it was facing the incident ions. Gradual formation of iron nitrides is observed with increasing ion fluence. Though the radiation damage exhibits itself only at this side of the ribbons, its influence upon bulk magnetic properties is clearly identified by the help of magnetic measurements. Hysteresis loops exhibit changes in their shape as well as coercive field. Along with the formation of magnetic crystalline phases (bcc‐Fe and nitrides), they are caused by structural rearrangement which takes place also inside the amorphous residual phase. Structural modifications are confirmed via evolution of hyperfine magnetic fields with ion fluence. Structural modification of the 57 Fe 81 Mo 10 Cu 1 B 10 alloy caused by ion irradiation as demonstrated by microstructural (Mössbauer spectrometry (a,b)) and macroscopic (hysteresis loops (c,d)) measurements. As‐quenched (a,c) and 2.5 × 10 17 N + /cm 2 irradiated (b,d) alloys are compared.