Open Access

Synthesis, structure and magnetic properties ofβ-MnO 2 nanorods

  • HaeJin Kim1,
  • JinBae Lee1,
  • Young-Min Kim2,
  • Myung-Hwa Jung3,
  • Z. Jagličić4,
  • P. Umek5 and
  • J. Dolinšek5Email author
Nanoscale Research Letters20072:81

DOI: 10.1007/s11671-006-9034-4

Received: 7 December 2006

Accepted: 8 December 2006

Published: 11 January 2007

Abstract

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.

Keywords

Self-assembled nanorods Manganese oxides Nanoscale magnetism

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Declarations

Acknowledgment

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

Authors’ Affiliations

(1)
Energy Nano Material Team, Korea Basic Science Institute
(2)
Division of Electron Microscopic Research, Korea Basic Science Institute
(3)
Quantum Material Research Team, Korea Basic Science Institute
(4)
Physics and Mechanics, Institute of Mathematics
(5)
J. Stefan Institute, University of Ljubljana

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© to the authors 2007