Magnetoelectric coupling in epitaxial orthorhombic YMnO3 thin films

Details Magnetoelectric coupling in epitaxial orthorhombic YMnO3 thin films Magnetoelectric coupling in epitaxial orthorhombic YMnO3 thin films

2007-01-16

arxiv.org/abs/cond-mat/0701387v1

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted

Scientific paper

We have grown epitaxial thin-films of the orthorhombic phase of YMnO3 oxide on Nb:SrTiO3(001) substrates and their structure, magnetic and dielectric response have been measured. We have found that a substrate-induced strain produces an in-plane compression of the YMnO3 unit cell. The temperature-dependent magnetization curves display a significant ZFC-FC hysteresis at temperatures below the Neel temperature (TN around 40K). The dielectric constant increases gradually (up to 26%) below TN and mimics the ZFC magnetization curve. We argue that these effects are a manifestation of magnetoelectric coupling in thin films and that the magnetic structure of YMnO3 can be controlled by substrate selection.

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