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Dielectric anomaly and magnetic response of epitaxial orthorhombic YMnO3 thin films

Published online by Cambridge University Press:  31 January 2011

X. Martí ,
V. Skumryev ,
V. Laukhin ,
F. Sánchez ,
M.V. García-Cuenca ,
C. Ferrater ,
M. Varela  and
J. Fontcuberta
X. Martí*
Affiliation:
Institut de Ciència de Materials de Barcelona, Consejo Superior de Investigaciones Cientificas (CSIC), Campus UAB, Bellaterra 08193, Spain
V. Skumryev
Affiliation:
Institut Català de Recerca i Estudis Avançats (ICREA), Barcelona, Spain; and Departament de Física, Universitat Autònoma de Barcelona, Bellaterra 08193, Spain
V. Laukhin
Affiliation:
Institut de Ciència de Materials de Barcelona, Consejo Superior de Investigaciones Cientificas (CSIC), Campus UAB, Bellaterra 08193, Spain; and Institut Català de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
F. Sánchez
Affiliation:
Institut de Ciència de Materials de Barcelona, Consejo Superior de Investigaciones Cientificas (CSIC), Campus UAB, Bellaterra 08193, Spain
M.V. García-Cuenca
Affiliation:
Departament de Física Aplicada I Óptica, Universitat de Barcelona, Diagonal 647, Barcelona 08028, Spain
C. Ferrater
Affiliation:
Departament de Física Aplicada I Óptica, Universitat de Barcelona, Diagonal 647, Barcelona 08028, Spain
M. Varela
Affiliation:
Departament de Física Aplicada I Óptica, Universitat de Barcelona, Diagonal 647, Barcelona 08028, Spain
J. Fontcuberta
Affiliation:
Institut de Ciència de Materials de Barcelona Consejo Superior de Investigaciones Cientificas (CSIC), Campus UAB, Bellaterra 08193, Spain
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The structure, magnetic response, and dielectric response of the grown epitaxial thin films of the orthorhombic phase of YMnO3 oxide on Nb:SrTiO3 (001) substrates have been measured. We have found that a substrate-induced strain produces an in-plane compression of the YMnO3 unit cell. The magnetization versus temperature curves display a significant zero-field cooling (ZFC)-field cooling hysteresis below the Néel temperature (TN ≈ 45 K). The dielectric constant increases gradually (up to 26%) below the TN and mimics the ZFC magnetization curve. We argue that these effects could be a manifestation of magnetoelectric coupling in YMnO3 thin films and that the magnetic structure of YMnO3 can be controlled by substrate selection and/or growth conditions.

Keywords

Thin filmFerroelectricFerromagnetic
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 8 , August 2007 , pp. 2096 - 2101
Copyright
Copyright © Materials Research Society 2007

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References

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