The influence of localized electronic states on the optical and magneto-optical properties and magnetoresistance in amorphous CoFeNiSiB alloys

V. Kravets*, A. Petford-Long, X. Portier, L. Poperenko, M. Kolesnik

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

The optical and magneto-optical properties of amorphous CoFeSiB ribbons were investigated for incident photons in the energy range from 0.05 to 2.2 eV. The Kerr rotation spectra for the amorphous films have a shape in the 0.6 - 2.2 eV region that is quite similar to that of bulk Co. The optical conductivity of the amorphous CoFe(Ni)SiB alloys increases slowly as a function of frequency (proportional to ω1/3) in the IR. Such a σ∼ω1/3 dependence in the IR suggests an additional localization of the electron states. A large room-temperature magnetoresistance effect has been demonstrated in thin Co71Fe7Si12B10 and Co59Fe5Ni10Si11B15 amorphous ribbons for alternating current at applied fields, H<80 Oe.

Original languageEnglish (US)
Pages (from-to)481-484
Number of pages4
JournalMaterials Science Forum
Volume373-376
DOIs
StatePublished - 2001
Event8th European Magnetic Materials and Applications Conference (EMMA 2000) - Kyiv, Ukraine
Duration: Jun 7 2000Jun 10 2000

Keywords

  • Amorphous metallic ribbons
  • Localized electronic states
  • Magnetoresistance
  • Optical and magneto-optical properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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