The role of the residual amorphous matrix in determining the temperature dependence of soft magnetic properties of nc alloys

L. K. Varga, F. Mazaleyrat, Gy Kovács, A. Kákay

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Abstract

We report here a large (300-400 K) increase of the decoupling temperature (Tcam) with increasing crystalline fraction in Nanoperm-type alloys. This is in contrast to the Finemet-type alloys where Tcam varies some tens of K only around the original as-cast amorphous Tc when the amorphous precursor is annealed around the first crystallization peak. Hc and Mr/Ms, versus T measurements have been used to monitor the exchange decoupling of the nanosized particles, because these parameters are more sensitive to decoupling than Ms and μ1, which show no characteristic change at the decoupling. This enhancement of Tcam has been tentatively attributed to the increasing boron content of the residual amorphous matrix whereas the zirconium atoms agglomerate in the grain boundary region.

Original languageEnglish
Pages (from-to)1550-1552
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume226-230
Issue numberPART II
DOIs
Publication statusPublished - Jan 1 2001

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Keywords

  • Magnetic decoupling
  • Nanocrystalline alloy
  • Residual amorphous phase

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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