Combinatorial fabrication and magnetic properties of homoepitaxial Co and Li co-doped NiO thin-film nanostructures

U. S. Joshi, K. Itaka, Y. Matsumoto, H. Koinuma

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Magnetic properties of nanostructured epitaxial thin layers of a series of Co and Li co-doped NiO on MgO(1 0 0) substrate with NiO buffer layer have been investigated. Thin films were synthesized by combinatorial laser molecular beam epitaxy (CLMBE) in the continuous binary composition spread approach. Large and linear variation of x was achieved in the growth of CoxLi0.2Ni0.8-xO, onto 9 mm of single substrate. Homoepitaxial growth with smooth surface morphology was confirmed by grazing incidence X-ray diffraction (GIXRD) and atomic force microscopy (AFM). Linear decrease in the band gap and optical transparency was observed with increasing cobalt concentration. The magneto-optical Kerr effect revealed a strong photon energy dependency with negative Kerr rotation for all the Co-concentrations in the film, suggesting intra-valence charge transfer (IVCT) between low spin state Co2+ with host Ni2+. Ferromagnetic (FM)-like ordering was observed at low temperatures, while antiferromagnetism predominates at room temperature in the Co and Li co-doped nickel oxide epitaxial films.

Original languageEnglish
Pages (from-to)3595-3599
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number21
DOIs
Publication statusPublished - 2009 Nov
Externally publishedYes

Keywords

  • Combinatorial PLD
  • Dilute magnetic semiconductor
  • MOKE

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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