Structure and Magnetism of Nanocrystalline and Epitaxial (Mn,Zn,Fe)3O4

Abstract

Nanocrystalline (NC) textured Mn0.5Zn0.6Fe1.9O4 (MZFO) films, grown at room temperature on both isostructural and non-isostructural substrates, show magnetization values significantly suppressed from epitaxial MZFO films. X-ray absorption spectroscopy and x-ray magnetic circular dichroism measurements indicate larger ratios of Fe3 to Fe2 ions on the tetrahedral sites in the NC films compared to the epitaxial films. The magnetization loops of the NC films are shifted by 200"400 Oe at low temperatures. No such effect is observed in the epitaxial films. We hypothesize that the presence of a more structurally disordered, possibly magnetically frustrated, matrix exchange biases the crystalline regions.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2012
Accession Number
ADA573859

Entities

People

  • A. J. Grutter
  • E. Arenholz
  • F. J. Wong
  • J. M. Iwata-harms
  • U.s. Alaan
  • V. V. Mehta
  • Y. Suzuki

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Diffraction
  • Electronic Mail
  • Films
  • High Temperature
  • Lasers
  • Light Sources
  • Low Temperature
  • Magnetic Properties
  • Materials
  • Materials Science
  • Military Research
  • Optical Properties
  • Spectra
  • Spectroscopy
  • Thin Films
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science
  • Physics

Readers

  • Materials Science and Engineering.
  • Nanofabrication and Microfabrication.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.