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TT: Fachverband Tiefe Temperaturen

TT 14: Multiferroics II (jointly with DF, DS, KR, MA)

TT 14.2: Vortrag

Montag, 14. März 2011, 17:15–17:30, HSZ 04

Strain effect on the magnetic properties of SrRuO₃ thin films on ferroelectric PMN-PT substrates — •Andreas Herklotz, Mikko Kataja, Ludwig Schultz, and Kathrin Dörr — IFW Dresden, IMW, Helmholtzstraße 20, 01069 Dresden, Germany

We investigate a two-component multiferroic system consisting of a ferroelectric 0.72PbMg_1/3Nb_2/3O₃-0.28PbTiO₃ (PMN-PT) substrate and ferromagnetic SrRuO₃ (SRO) thin films. The inverse piezoelectric effect of the substrate is used to reversibly vary the strain state of the epitaxial SRO films in order to clarify the strain dependence of the magnetic film properties. Buffer films of Sr_1−xBa_xTiO₃ are introduced to vary the as-grown state of the SRO films and to cover a wider range from compressive to tensile strain.

High resolution X-ray diffraction is deployed to structurally characterize the films and to determine Poisson’s ratio of SRO, which is not known so far. SQUID magnetometry reveals that the Curie temperature is increasing with tensile strain, but starts to decrease again under high strain. Angular-dependent measurements provide that the easy axis orientation shows a complex dependence on strain and temperature. SQUID measurements on conventional substrates like SrTiO₃ and LaAlO₃ and electric transport measurements complete the data.