Analysis of magneto-elastic coupling mechanisms in FePt/BaTiO3 bilayers through structural and magnetic characterization

A. ROMAN; A. LOPEZ PEDROSO; L. NEÑER; D. PEREZ; AGUIRRE M. H.; M. SOARES; M. SIRENA; A. BUTERA; L. B. STEREN

Conferencia; 9th Joint European Magnetic Symposia (JEMS) Conference 2018; 2018

Text The design and fabrication of multiferroics (MF) is one of the main challenges for the development ofoxide spintronics. Tuning the magnetic state by electric field or strains appears to be the key for low-energydevices. Magneto-electric and magneto-elastic coupling at interfaces between ferromagnetic (FM) andferroelectric (FE) layers are at the origin of these phenomena [1]. First-principle calculations revealedrecently that important changes of magnetic anisotropy should be observed on FePt/BaTiO3 structures whenBaTiO3(BTO) is poled [2]. Moreover, BTO piezoelectric and FePt magnetostrictive properties makeFePt/BTO heterostructure a highly tunable multiferoic. To study coupling mechanisms in the FePt/BTOstructures, we grew a series of FePt/BTO bilayers by sputtering onto (001) SrTiO3 substrates. Thecharacterization of the FePt/BTO magnetic anisotropy was performed by magnetization measurements,while the domain structure was observed by magnetic force microscopy. The crystalline structure of eachconstituents was investigated in different geometries and temperatures by X-ray Diffraction usingsynchrotron radiation at LNLS-Campinas. The analysis of the results, in particular the correlation betweencrystalline and magnetic properties allows us to get a deep insight into the magneto-elastic couplingmechanisms in this system.[1] C. A. Vaz, J. Phys: Condens. Matter, 24, 333201(2012)[2] M. Lee et al, J. Appl. Phys., 113, 17C729 (2013)