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Title: Low temperature behavior of hyperfine fields in amorphous and nanocrystalline FeMoCuB

Low temperature (4.2 K) magnetic behavior of Fe{sub 76}Mo{sub 8}Cu{sub 1}B{sub 15} metallic glass was studied by {sup 57}Fe Mössbauer spectrometry (MS) and {sup 57}Fe NMR. Distributions of hyperfine magnetic fields P(B) were determined for as-quenched and annealed (nanocrystalline) samples with relative fraction of the grains about 43%. P(B) distributions were derived for both the amorphous matrix and nanocrystalline grains. NMR of alloys with natural and {sup 57}Fe enriched Fe enabled to assess the contribution of {sup 11}B to the total NMR signal. P(B) distribution of the as-quenched alloy derived from MS matches reasonably well the one from NMR of the enriched sample. NMR signal from the sample with natural Fe exhibits contributions from {sup 11}B nuclei. The principal NMR lines of the annealed alloys at 47 MHz correspond to bcc Fe nanocrystals. Small asymmetry of the lines towards higher frequencies might be an indication of possible impurity atoms in the bcc structure. The observed differences between natural and enriched samples are attributed to higher sensitivity in the latter. Positions of the lines attributed to bcc Fe nanocrystals obtained from MS and NMR are in perfect agreement.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4] ;
  1. Department of Low Temperature Physics, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Prague (Czech Republic)
  2. Institute of Inorganic Chemistry AS CR, v. v. i., 250 68 Husinec-Řež 1001 (Czech Republic)
  3. Department of Nuclear Reactors, Faculty of Nuclear Science and Physical Engineering, Czech Technical University in Prague, V Holešovičkách 2, 180 00 Prague 8 (Czech Republic)
  4. Institute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, 842 15 Bratislava (Slovakia)
Publication Date:
OSTI Identifier:
22409974
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; ANNEALING; BCC LATTICES; BORON 11; BORON ALLOYS; COPPER ALLOYS; CRYSTALS; IRON 57; IRON BASE ALLOYS; MAGNETIC FIELDS; METALLIC GLASSES; MHZ RANGE; MOLYBDENUM ALLOYS; NANOSTRUCTURES; NMR SPECTRA; NUCLEAR MAGNETIC RESONANCE; TEMPERATURE DEPENDENCE