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Title: Room temperature ferromagnetism of ZnO nanocrystals in amorphous ZnO- Al2 O3 matrix
Authors: Ma, Y.W.
Ding, J. 
Qi, D.C. 
Yi, J.B. 
Fan, H.M. 
Gong, H. 
Wee, A.T.S. 
Rusydi, A. 
Issue Date: 2009
Source: Ma, Y.W., Ding, J., Qi, D.C., Yi, J.B., Fan, H.M., Gong, H., Wee, A.T.S., Rusydi, A. (2009). Room temperature ferromagnetism of ZnO nanocrystals in amorphous ZnO- Al2 O3 matrix. Applied Physics Letters 95 (7) : -. ScholarBank@NUS Repository.
Abstract: In this work, we demonstrate room temperature ferromagnetism of ZnO nanocrystals (NCs) embedded in alumina-based amorphous matrix. Our study has shown that solid solution occurred for lower Al concentration [≥x=0.09 for (Zn1-x, Alx) O]. No ferromagnetism appears in Al-doped ZnO with x≥0.09. With higher Al concentration, alumina-based amorphous structure appeared and fully amorphous was found in the composition of (Zn 0.30, Al0.70) O. Ferromagnetism was found in (Zn 1-x, Alx) O with a threshold of 16 mol % of Al. The room temperature ferromagnetism was found to be attributed to ZnO NCs in an alumina-based amorphous ZnO- Al2 O3 matrix. Ferromagnetism reached a maximum with a volume percentage of ZnO NCs to be ∼27 vol %. The detailed investigations (transmission electron microscopy, x-ray photoelectron spectroscopy, and superconducting quantum interference device) show that the optimized size of these NCs is in the range of 4-5 nm. No ferromagnetism appears if the sample contains a fully amorphous structure. © 2009 American Institute of Physics.
Source Title: Applied Physics Letters
ISSN: 00036951
DOI: 10.1063/1.3206654
Appears in Collections:Staff Publications

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