Epitaxial Magnetic Oxide Nanocrystals Via Phase Decomposition of Bismuth Perovskite Precursors

Kashinath A. Bogle, Jeffrey Cheung, Yong-Lun Chen, Sheng-Chieh Liao, Chih-Hung Lai, Ying-Hao Chu, John M. Gregg, Satishchandra B. Ogale, Valanoor Nagarajan

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The phase instability of bismuth perovskite (BiMO3), where M is a ferromagnetic cation, is exploited to create self-assembled magnetic oxide nanocrystal arrays on oxide supports. Conditions during pulsed laser deposition are tuned so as to induce complete breakdown of the perovskite precursor into bismuth oxide (Bi2 O3 ) and metal oxide (M-Ox ) pockets. Subsequent cooling in vacuum volatizes the Bi2 O3 leaving behind an array of monodisperse nanocrystals. In situ reflective high energy electron diffraction beam is exploited to monitor the synthesis in real-time. Analysis of the patterns confi rms the phase separation and volatization process. Successful synthesis of M-Ox, where M = Mn, Fe, Co, and Cr, is shown using this template-free facile approach. Detailed magnetic characterization of nanocrystals is carried out to reveal the functionalities such as magnetic anisotropy as well as larger than bulk moments, as expected in these oxide nanostructures.

Original languageEnglish
Pages (from-to)5224-5230
Number of pages7
JournalAdvanced Functional Materials
Volume22
Issue number24
Early online date31 Jul 2012
DOIs
Publication statusPublished - 19 Dec 2012

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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