Dielectric anomalies in orthorhombic YMnO3 thin films

We report on the magnetodielectric characterization of orthorhombic (001) oriented YMnO3 thin films grown by PLD on Nb-doped SrTiO3. Detailed temperature, magnetic field and frequency dependent measurements are used to determine dielectric and magnetodielectric response and to analyse its origin. A...

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Bibliographic Details
Published in:Thin solid films 2010-06, Vol.518 (16), p.4710-4713
Main Authors: FINA, I, MARTI, X, FABREGA, L, SANCHEZ, F, FONTCUBERTA, J
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric loss
Dielectric strength
Dielectric thin films
Dielectrics
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
Joining
Magnetic fields
Magnetic properties
Niobium
Origins
Physics
Thin films
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Summary:We report on the magnetodielectric characterization of orthorhombic (001) oriented YMnO3 thin films grown by PLD on Nb-doped SrTiO3. Detailed temperature, magnetic field and frequency dependent measurements are used to determine dielectric and magnetodielectric response and to analyse its origin. A dielectric peak below the Neel temperature is observed. We show that this peak signals a magnetoelectric coupling as inferred from a magnetocapacitance of about 2% at 8T and 25K. A careful analysis of the impedance spectroscopy allows concluding that both the dielectric peak and the measured magnetocapacitance are intrinsic properties of YMnO3. At higher temperatures (>200K) another dielectric feature (a strong frequency dependency and a peak in the dielectric losses) is observed, which is ascribed to the Maxwell-Wagner behaviour and thus it is not a genuine response of stoichiometric YMnO3.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2009.12.065