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ARTIFICIAL MULTIFERROICS NANOSTRUCTURES BASED ON FERRITES / BATIO3 LOW DIMENSIONAL EPITAXIAL STRUCTURES A. Barbier1,,, P.L. Nguyen1, B. Sarpi2, F. Petronio1,2, M. Rioult1,2, T. Aghavnian1,2, J.B. Moussy1, D. Stanescu1, H. Magnan1, C. Mocuta2, A. Vlad2, A. Resta2, P. Ohresser2, F.Maccherozzi4, C. Rountree1, N. Jedrecy3, R. Belkhou2 1 Service de Physique de lEtat Condens, SPEC, CEA, CNRS, UMR 3680, Universit ParisSaclay, CEA Saclay, 91191 GifsurYvette Cedex, France 2 Synchrotron SOLEIL, LOrme des Merisiers SaintAubin, 91192 GifsurYvette, France 3 INSP, UPMCSorbonne Universits, 75252 Paris Cedex 05, France 4 Diamond Light Source, Oxforshire, United Kingdom. Email: antoine.barbiercea.fr Multiferroic materials are of high technological interest because they are expected to lead to important applications and useful devices in important fields including spintronics, sensors, multiple state memory cells, energy harvesting etc. Intrinsic single phase multiferroic materials are seldom and new routes have to be explored. Associating, at the nanoscale, ferromagnetic and ferroelectric materials is a challenging route to obtain magnetoelectric multiferroics. We explored a number of possibilities resulting from the combination of single crystalline atomic oxygen assisted molecular beam epitaxy (AOMBE) grown thin films including prototypical ferroelectric BaTiO3 layers deposited on conductive substrates, typically Nb doped SrTiO3(001). We considered ferromagnetic elements doping, laminar MFe2O4/ BaTiO3 (MFe, Co, Ni, Mn) systems and more recently embedded nanostructures realized by combined AOMBE and laser lithography processes. These compounds/materials have reasonable electric polarization and are environment friendly. All systems were found with reasonable electric polarization. The indepth understanding of the nature of the couplings is challenging. To tackle these issue simultaneous structural, ferroelectric and magnetic measurements were necessary. We combined laboratory tools with state of the art synchrotron radiation, well suited techniques, including Xray diffraction, magnetic dichroism, and spectromicroscopy to describe the artificial multiferroic structures. |
