Pulsed laser deposition of oxide thin films on buffered Si(100) substrate

. A. CARRERO, A. LO GIUDICE, A. ROMAN, S. CARREIRA, A. LOPEZ PEDROSO, M. AGUIRRE, L. STEREN

Conferencia; 9th Joint European Magnetic Symposia; 2018

Nowadays, a huge effort is being made in the integration of oxides to silicon waffers with the aim of improving existing electronic devices or introducing new ones. In parallel, there has been an increasing interest in developing artificial multiferroics, built of ferromagnets and ferroelectrics, to add original functionalities to advanced materials,taking advantages of interfacial couplings. A model system for oxide-based multiferroics is the La0,67Sr0,33MnO3/BaTiO3 (LSMO/BTO) structure. On one hand, the LSMO is ferromagnet and half-metal while the BTO is ferroelectric at room temperature, having both a perovskite-like structure. However, oxide/silicon structures are still a challenging goal due to the high reactivity of the silicon to oxygen, cationic interdifusion and mismatch of thermal expansion coefficients and lattices. In our work, we show the successfully growth of LSMO and BTO crystalline films and bilayers made by PLD onto Si(100) substrates, using different buffers. An exhaustive structural and morphological characterization of the samples was carried out to analyze their properties. The films´growth was monitored by RHEED while the lattice parameters were determined by XRD. High-resolution TEM was used to examine in detail the quality of the interfaces regarding strains, stacking and composition of the constituents. A correlation of structural, magnetic and ferroelectric properties of the different structures will be discussed in this presentation.