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

Srinivasan Radhakrishnan; Jagannathan Rangarajan; Klaus Baerner

doi:10.1117/1.JNP.8.083086

11 June 2014 Magnetic phases in EuMnO3 nanoceramics probed using ultraviolet excited opto-impedance

Srinivasan Radhakrishnan, Jagannathan Rangarajan, Klaus Baerner

Author Affiliations +

Journal of Nanophotonics, Vol. 8, Issue 1, 083086 (June 2014). https://doi.org/10.1117/1.JNP.8.083086

Abstract

EuMnO₃ nanocrystals (Φ _av ∼5 nm ) synthesized using sol-gel thermolysis exhibit significant difference in magnetic structure in comparison to their bulk-counterpart (Φ _av ∼3 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.

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Srinivasan Radhakrishnan, Jagannathan Rangarajan, and 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

Published: 11 June 2014

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