Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 7: Multiferroics 2 (jointly with DF, KR, MA, TT)

DS 7.4: Talk

Monday, March 11, 2013, 15:45–16:00, H3

Strain-induced changes of magnetic anisotropy in epitaxial spinel-type cobalt ferrite films — •Stefania Florina Rus^1,2, Andreas Herklotz^2,4, Ioan Grozescu³, and Kathrin Dörr⁴ — ¹Politehnica University of Timişoara, 300006 Timişoara, Romania — ²IFW Dresden, 01171 Dresden, Germany — ³Institute for Research and Development in Electrochemistry and Condensed Matter, 300224 Timisoara, Romania — ⁴Martin-Luther-Universität Halle-Wittenberg, Institute for Physics, 06099 Halle, Germany

We present results on the effect of biaxial strain on the magnetic anisotropy of thin films of the parent compound CoFe2O4 and films with a partial substitution of Co and Fe by Zr and Pt, respectively. The strain states of the epitaxially grown films are controlled twofold: (i) statically by epitaxial misfit strain via an appropriate choice of substrates and buffer layers and (ii) reversibly by strain transfer from piezoelectric Pb(Mg_1/3Nb_2/3)_0.72Ti_0.28O₃ (001) (PMN-PT) substrates. Due to large negative magnetostriction all films show an out-of-plane magnetic easy axis under tensile strain and an in-plane easy axis under compressive strain. Our reversible strain measurements show that the magnetic anisotropy can be efficiently altered by the application of an electric field to the ferroelectric PMN-PT substrates. The effect of substitution with Zr and Pt on the magnetoelectric effect will be discussed. This work is supported by the strategic grant POSDRU ID77265 (2010), co-financed by the European Social Fund, within the Sectoral Operational Programme Human Resources Development 2007-2013. Advising by P. Vlazan is greatly acknowledged.