11 June 2014 Magnetic phases in EuMnO3 nanoceramics probed using ultraviolet excited opto-impedance
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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.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Srinivasan Radhakrishnan, Srinivasan Radhakrishnan, Jagannathan Rangarajan, Jagannathan Rangarajan, Klaus Baerner, Klaus Baerner, } "Magnetic phases in EuMnO3 nanoceramics probed using ultraviolet excited opto-impedance," Journal of Nanophotonics 8(1), 083086 (11 June 2014). https://doi.org/10.1117/1.JNP.8.083086 . Submission:
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