Anomalous magnetic properties of the nano-size residual amorphous phase in nanocrystals

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Abstract

The composition dependence of the Curie temperature and the magnetic moment of the nano-size residual amorphous phase in partially crystallized Fe92-xZr7BxCu1 (2≤x≤23) amorphous alloys were determined by 57Fe Moessbauer spectroscopy. Both quantities show broad minima and for increasing relative Zr content (i.e. for decreasing B concentration) surpass the usual monotonic decrease observed for the bulk counterparts. The deviation does not scale with the characteristic size of the residual amorphous regions, which was found to be constant, ruling out explanations based on interphase exchange interaction. A magnetovolume origin of the observed anomalous composition dependence and the improved soft-magnetic characteristics of these nanocrystals is proposed.

Original languageEnglish
JournalJournal of Physics Condensed Matter
Volume11
Issue number17
DOIs
Publication statusPublished - May 3 1999

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Nanocrystals
Magnetic properties
nanocrystals
magnetic properties
Exchange interactions
Amorphous alloys
Curie temperature
Magnetic moments
Chemical analysis
magnetic moments
Spectroscopy
deviation
spectroscopy
interactions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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title = "Anomalous magnetic properties of the nano-size residual amorphous phase in nanocrystals",
abstract = "The composition dependence of the Curie temperature and the magnetic moment of the nano-size residual amorphous phase in partially crystallized Fe92-xZr7BxCu1 (2≤x≤23) amorphous alloys were determined by 57Fe Moessbauer spectroscopy. Both quantities show broad minima and for increasing relative Zr content (i.e. for decreasing B concentration) surpass the usual monotonic decrease observed for the bulk counterparts. The deviation does not scale with the characteristic size of the residual amorphous regions, which was found to be constant, ruling out explanations based on interphase exchange interaction. A magnetovolume origin of the observed anomalous composition dependence and the improved soft-magnetic characteristics of these nanocrystals is proposed.",
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T1 - Anomalous magnetic properties of the nano-size residual amorphous phase in nanocrystals

AU - Kaptás, D.

AU - Kemény, T.

AU - Balogh, J.

AU - Bujdosó, L.

AU - Kiss, L.

AU - Pusztai, T.

AU - Vincze, I.

PY - 1999/5/3

Y1 - 1999/5/3

N2 - The composition dependence of the Curie temperature and the magnetic moment of the nano-size residual amorphous phase in partially crystallized Fe92-xZr7BxCu1 (2≤x≤23) amorphous alloys were determined by 57Fe Moessbauer spectroscopy. Both quantities show broad minima and for increasing relative Zr content (i.e. for decreasing B concentration) surpass the usual monotonic decrease observed for the bulk counterparts. The deviation does not scale with the characteristic size of the residual amorphous regions, which was found to be constant, ruling out explanations based on interphase exchange interaction. A magnetovolume origin of the observed anomalous composition dependence and the improved soft-magnetic characteristics of these nanocrystals is proposed.

AB - The composition dependence of the Curie temperature and the magnetic moment of the nano-size residual amorphous phase in partially crystallized Fe92-xZr7BxCu1 (2≤x≤23) amorphous alloys were determined by 57Fe Moessbauer spectroscopy. Both quantities show broad minima and for increasing relative Zr content (i.e. for decreasing B concentration) surpass the usual monotonic decrease observed for the bulk counterparts. The deviation does not scale with the characteristic size of the residual amorphous regions, which was found to be constant, ruling out explanations based on interphase exchange interaction. A magnetovolume origin of the observed anomalous composition dependence and the improved soft-magnetic characteristics of these nanocrystals is proposed.

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