Magnetoelectric coupling in epitaxial orthorhombic YMnO3 thin films

Marti, X.; Skumryev, V.; Laukhin, V.; Sanchez, F.; Garcia-Cuenca, M. V.; Ferrater, C.; Varela, M.; Fontcuberta, J.
Bibliographical reference

eprint arXiv:cond-mat/0701387

Advertised on:
1
2007
Number of authors
8
IAC number of authors
0
Citations
2
Refereed citations
1
Description
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.