Research Papers

Magnetic phases in EuMnO3 nanoceramics probed using ultraviolet excited opto-impedance

[+] Author Affiliations
Srinivasan Radhakrishnan

Central Electrochemical Research Institute, Karaikudi 630006, Tamil Nadu, India

Jagannathan Rangarajan

Central Electrochemical Research Institute, Karaikudi 630006, Tamil Nadu, India

Klaus Baerner

University of Goettingen, Department of Physics, Physikalisches Institut, Goettingen 37073, Germany

J. Nanophoton. 8(1), 083086 (Jun 11, 2014). doi:10.1117/1.JNP.8.083086
History: Received January 7, 2014; Revised April 25, 2014; Accepted May 14, 2014
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Abstract.  EuMnO3 nanocrystals (Φav5nm) synthesized using sol-gel thermolysis exhibit significant difference in magnetic structure in comparison to their bulk-counterpart (Φav3μm). Opto- and magneto-impedance techniques are successful local probes to bring out the difference between the bulk, nano-manganites with the latter manifesting in multiplicity of spin-defect ensembles attributed to pronounced difference between surface and core states. Electron paramagnetic resonance spectra also confirm the variety of spin-defect ensembles arising from pronounced surface states. Upon optical perturbation, there is significant drop in resistivity (approximately four orders) at room temperature observed for the bulk EuMnO3, an otherwise insulating system, which suggests an interesting scope for possible application.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Srinivasan Radhakrishnan ; Jagannathan Rangarajan and Klaus Baerner
"Magnetic phases in EuMnO3 nanoceramics probed using ultraviolet excited opto-impedance", J. Nanophoton. 8(1), 083086 (Jun 11, 2014). ; http://dx.doi.org/10.1117/1.JNP.8.083086


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