RUS Florina Stefania National Institute for Research and Development in Electrochemistry and Condensed Matter

Tuning the Magnetoelectric Properties with Strain in Epitaxial Co0.9Sn0.1Fe2O4 Thin Films

Co-authors HERKLOTZ Andreas

We have grown epitaxial Sn substituted cobalt ferrite thin films of various thicknesses on piezoelectric Pb(Mg1/3Nb2/3)0.72Ti0.28O3 (PMN-PT) substrates and investigated the strain-induced changes of magnetic properties. All films described in this work have been deposited by pulsed laser deposition (PLD) from stoichiometric target of Co0.9Sn0.1Fe2O4 (CSFO). The lattice structure, crystallinity and orientation of the thin films were determined by X-ray diffraction analysis. The magnetization of thin films was measured for both in-plane out-of-plane configurations using a superconductor quantum interference device (SQUID) magnetometer at 300 K. The measurements reveal that the magnetic anisotropy is altered by the strain imposed from the substrate upon application of an electric field. However, we find that this strain effect is thickness dependent. The biggest strain effect is recorded for the thickest film (400 nm) where an electric-field-controlled contraction of the substrate of 0.1 % induces a relative change in magnetic moment of 9.3 % [1]. The relative change of the remanent magnetisation is reduced with decreasing film thickness and is smaller than 3 % for the thinnest film (25 nm). ACKNOWLEDGEMENTS: The authors want to thank P. Vlazan for assistance with obtaining the target material. LITERATURE: [1] S. F. Rus “Nanomateriale oxidice de tipul AB2O4 cu aplicatii in senzoristica” editure Politehnica (2014), Timisoara, ISBN 978-606-554-782-7.

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