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Journal of Nanophotonics

Magnetic phases in EuMnO3 nanoceramics probed using ultraviolet excited opto-impedance
Author(s): Srinivasan Radhakrishnan; Jagannathan Rangarajan; Klaus Baerner
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Paper Abstract

EuMnO3 nanocrystals (Φ av5  nm ) synthesized using sol-gel thermolysis exhibit significant difference in magnetic structure in comparison to their bulk-counterpart (Φ av3  μm ). 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.

Paper Details

Date Published: 11 June 2014
PDF: 11 pages
J. Nanophoton. 8(1) 083086 doi: 10.1117/1.JNP.8.083086
Published in: Journal of Nanophotonics Volume 8, Issue 1
Show Author Affiliations
Srinivasan Radhakrishnan, Central Electrochemical Research Institute (India)
Jagannathan Rangarajan, Central Electrochemical Research Institute (India)
Klaus Baerner, Univ. Göttingen (Germany)

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