Analysis of the magnetoresistance contributions in a nanocrystallized Cr-doped FINEMET alloy

L. F. Kiss, V. Franco, M. Csontos, L. Péter, C. F. Conde, A. Conde, T. Kemény, J. Tóth, L. K. Varga, I. Bakonyi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The magnetoresistance (MR) was measured at 200, 250 and 300 K in magnetic fields up to B=12 T for a nanocrystallized Fe63.5Cr 10Nb3Cu1Si13.5B9 alloy. Both the longitudinal (LMR) and transverse (TMR) component of the magnetoresistance decreased from B=0 to about 0.1 T. This could be ascribed to a giant MR (GMR) effect due to spin-dependent scattering of conduction electrons along their path between two FeSi nanograins via the non-magnetic matrix. Such a scattering may occur if the nanograin moments are not or only weakly coupled in the absence of a strong exchange coupling (due to the high Cr content in the matrix) and/or only weak dipoledipole coupling is present (due to sufficiently large separations between the nanograins). For larger fields, the GMR saturated and a slightly nonlinear increase in MR with B was observed due to a contribution by the residual amorphous matrix. The anisotropic MR effect (AMR≡LMR-TMR) was negative for all fields and temperatures investigated. By measuring the MR of melt-quenched Fe100-xSix solid solutions with x=15, 18, 20, 25 and 28, the observed AMR could be identified as originating from the FeSi nanograins having a D03 structure.

Original languageEnglish
Pages (from-to)699-707
Number of pages9
JournalJournal of Magnetism and Magnetic Materials
Volume323
Issue number6
DOIs
Publication statusPublished - Mar 1 2011

Keywords

  • Amorphous alloys
  • FINEMET alloys
  • FeSi alloys
  • Magnetoresistance
  • Nanocrystallization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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