標題: Epitaxial Magnetic Oxide Nanocrystals Via Phase Decomposition of Bismuth Perovskite Precursors
作者: Bogle, Kashinath A.
Cheung, Jeffrey
Chen, Yong-Lun
Liao, Sheng-Chieh
Lai, Chih-Hung
Chu, Ying-Hao
Gregg, John M.
Ogale, Satishchandra B.
Valanoor, Nagarajan
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: epitaxial nanostructures;bismuth perovskites;phase separation;Bi2O3 evaporation;magnetic oxides
公開日期: 19-十二月-2012
摘要: 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 (Bi2O3) and metal oxide (M-Ox) pockets. Subsequent cooling in vacuum volatizes the Bi2O3 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 confirms 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.
URI: http://dx.doi.org/10.1002/adfm.201201066
http://hdl.handle.net/11536/20822
ISSN: 1616-301X
DOI: 10.1002/adfm.201201066
期刊: ADVANCED FUNCTIONAL MATERIALS
Volume: 22
Issue: 24
起始頁: 5224
結束頁: 5230
顯示於類別:期刊論文


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