Room temperature ferromagnetism in Mn-doped TiO2 nanopillar matrices

Meredith C.K. Sellers, Edmund G. Seebauer

Research output: Contribution to journalArticle

Abstract

Diluted magnetic semiconductors have attracted considerable attention for potential applications in spintronics. Morphology and microstructure exert strong, but complicated, effects upon ferromagnetic behavior. To partially unravel such effects, the present work compares room temperature ferromagnetism (RTFM) in Mn-doped anatase TiO2 films synthesized by two different atomic layer deposition protocols, leading to either nanopillars or more conventional columnar grains. RTFM is largely unaffected by this difference for undoped material, but nanopillaring greatly increases both the coercive field (100 Oe) and saturation magnetization (14-21 emu/cm3) for Mn doping up to 2.7 at%. Nanopillaring seems to enhance the congregation of defect-related bound magnetic polarons near grain boundaries, thereby increasing RTFM.

Original languageEnglish (US)
Pages (from-to)44-47
Number of pages4
JournalMaterials Letters
Volume114
DOIs
StatePublished - Jan 1 2014

Keywords

  • Ferromagnetism
  • Grain boundaries
  • Nanocrystalline materials
  • Semiconductors
  • TiO

ASJC Scopus subject areas

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

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