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Open Access Nano Express

Synthesis, structure and magnetic properties ofβ-MnO2nanorods

HaeJin Kim1, JinBae Lee1, Young-Min Kim2, Myung-Hwa Jung3, Z Jagličić4, P Umek5 and J Dolinšek5*

Author Affiliations

1 Energy Nano Material Team, Korea Basic Science Institute, Daejeon, 305-806, Korea

2 Division of Electron Microscopic Research, Korea Basic Science Institute, Daejeon, 305-806, Korea

3 Quantum Material Research Team, Korea Basic Science Institute, Daejeon, 305-806, Korea

4 Institute of Mathematics, Physics and Mechanics, Jadranska 19, Ljubljana, 1000, Slovenia

5 J. Stefan Institute, University of Ljubljana, Jamova 39, Ljubljana, 1000, Slovenia

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Nanoscale Research Letters 2007, 2:81-86  doi:10.1007/s11671-006-9034-4

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