Charge-order driven multiferroic and magneto-dielectric properties of rare earth manganates

Charge-order driven magnetic ferroelectricity is shown to occur in several rare earth manganates of the general formula, Ln 1− x A x MnO 3 (Ln = rare earth, A = alkaline earth). Charge-ordered manganates exhibit dielectric constant anomalies around the charge-ordering or the antiferromagnetic transi...

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Bibliographic Details
Published in:Bulletin of materials science 2010-04, Vol.33 (2), p.169-178
Main Authors: Serrao, Claudy Rayan, Sahu, Jyoti Ranjan, Ghosh, Anirban
Format: Article
Language:English
Subjects:
Antiferromagnetism
Chemistry and Materials Science
Dielectric constant
Dielectric properties
Earth
Engineering
Ferroelectricity
Joining
Magnetic fields
Magnetic properties
Manganates
Materials Science
Order parameters
Rare earth metals
Transition temperature
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Summary:Charge-order driven magnetic ferroelectricity is shown to occur in several rare earth manganates of the general formula, Ln 1− x A x MnO 3 (Ln = rare earth, A = alkaline earth). Charge-ordered manganates exhibit dielectric constant anomalies around the charge-ordering or the antiferromagnetic transition temperature. Magnetic fields have a marked effect on the dielectric properties of these compounds, indicating the presence of coupling between the magnetic and electrical order parameters. Magneto-dielectric properties are retained in small particles of the manganates. The observation of magneto-ferroelectricity in these manganates is in accordance with theoretical predictions.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-010-0024-x