Electrical resistivity in ferromagnetic TM-Al-O (TM = Fe, Co) granular films: scattering by spin waves and kondo like behavior

Shintaro Nakamura, Tsutomu Nojima, Akira Yoshihara, Shigehiro Ohnuma, Hiroyasu Fujimori

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We investigate the electrical resistivity of the ferromagnetic granular thin films TM-Al-O (TM = Fe, Co). The resistivity shows T 2behavior at low temperatures in all metallic samples. This strongly suggests scattering of conduction electrons by thermally excited ferromagnetic spin waves. Logarithmic Kondo like behavior (mdashlog T) in the resistivity and negative magnetoresistivity at low temperatures are observed. With decreasing concentration of transition metal, both the coefficients of the T 2and log T terms increase.

Original languageEnglish
Article number074708
JournalJournal of the Physical Society of Japan
Volume78
Issue number7
DOIs
Publication statusPublished - 2009 Jul 1

Keywords

  • Co-Al-O
  • Electrical resistivity
  • Fe-Al-O
  • Ferromagnetic order
  • Granular film
  • Kondo like behavior
  • Magnetoresistivity
  • Magnon scattering
  • Spin wave
  • Transition metal

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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