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  • Nano Express
  • Open Access

Synthesis, structure and magnetic properties ofβ-MnO 2 nanorods

  • 1,
  • 1,
  • 2,
  • 3,
  • 4,
  • 5 and
  • 5Email author
Nanoscale Research Letters20072:81

  • Received: 7 December 2006
  • Accepted: 8 December 2006
  • Published:


We present synthesis, structure and magnetic properties of structurally well-ordered single-crystalline β-MnO2nanorods of 50–100 nm diameter and several µm length. Thorough structural characterization shows that the basic β-MnO2material is covered by a thin surface layer (2.5 nm) of α-Mn2O3phase with a reduced Mn valence that adds its own magnetic signal to the total magnetization of the β-MnO2nanorods. The relatively complicated temperature-dependent magnetism of the nanorods can be explained in terms of a superposition of bulk magnetic properties of spatially segregated β-MnO2and α-Mn2O3constituent phases and the soft ferromagnetism of the thin interface layer between these two phases.


  • Self-assembled nanorods
  • Manganese oxides
  • Nanoscale magnetism




This work was supported by the Frontier Research Laboratory Program at the Korea Basic Science Institute.

Authors’ Affiliations

Energy Nano Material Team, Korea Basic Science Institute, Daejeon, 305-806, Korea
Division of Electron Microscopic Research, Korea Basic Science Institute, Daejeon, 305-806, Korea
Quantum Material Research Team, Korea Basic Science Institute, Daejeon, 305-806, Korea
Physics and Mechanics, Institute of Mathematics, Jadranska 19, Ljubljana, 1000, Slovenia
J. Stefan Institute, University of Ljubljana, Jamova 39, Ljubljana, 1000, Slovenia


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