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Sujet de stage / Master 2 Internship

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Study of artificial multiferroic composites MFe2O4/BaTiO3 (M=Co, Ni, Mn)

Contact: BARBIER Antoine, , antoine.barbier@cea.fr, +33 1 69 08 39 23
Summary:
The objective of the internship is to study ferrimagnetic ferrite inclusions (MFe2O4, M=Co ,Ni ,Mn) in a ferroelectric BaTiO3 matrix. The realization of the samples will benefit from the expertise gained in recent years, in the CEA/SPEC laboratory, in growing thin films of such compounds by molecular beam epitaxy. The study will be realized by advanced methods using synchrotron radiation at synchrotron-SOLEIL.
Possibility of continuation in PhD: Oui
Deadline for application:01/04/2019

Full description:
The magneto-electric coupling between ferroelectric and ferro, ferri or antiferro-magnetic oxides is nowadays of high interest in the field of spintronics and energy conversion. Mastering this type of oxide nanostructures in the form of embedded microstructures is particularly relevant today. In such systems there is a strong interdependence between the magnetic, ferroelectric and structural parameters. A relevant study must address all of these aspects.
The BaTiO3 is an archetypical ferroelectric material that belongs to the family of ferroelectric oxides with a perovskite structure. Ferrites have many advantages like high Curie temperature and high chemical stability. The inclusion of ferrites microstructures in a BaTiO3 film is a very suitable system for understanding the mechanisms underlying the multiferroic properties.
The growth of thin films of these materials is already mastered in the CEA/SPEC laboratory. The deposits are realized by molecular beam epitaxy assisted by atomic oxygen plasma. Within the internship ultra-high vacuum growth techniques will also be used. The encapsulated ferrite samples will be studied on beamlines DIFFABS, DEIMOS and HERMES at synchrotron SOLEIL to access to the crystalline properties, chemical mapping as well as the magnetic and ferroelectric orders.
The developed of such layers during this internship is part of a long-term research program. This topic may be extended by a thesis work. The intership as well as the PhD may lead to a co-management between the CEA / SPEC laboratory and synchrotron SOLEIL beamlines. The intern will administratively depend on synchrotron SOLEIL and associated with the CEA/SPEC laboratory.

Contacts : MOCUTA Cristian, +33 1 69 35 81 20, mocuta@synchrotron-soleil.fr; OHRESSER Philippe, +33 1 69 35 96 82, philippe.ohresser@synchrotron-soleil.fr; BARBIER Antoine, +33 1 69 08 39 23, antoine.barbier@cea.fr
Technics/methods used during the internship:
The candidate will address the UHV techniques associated with the growth by molecular beam epitaxy and a first approach of studies conducted on large instruments. The techniques that will be used are Reflexion High Energy Electron Diffraction (RHEED), Auger Electron Spectroscopy (AES), Photoemission core level spectroscopy (XPS), Piezo Force Microscopy (PFM), Low Energy Electron microscopy (LEEM), X-ray diffraction on the DIFFABS beamline and eventually X-ray absorption spectroscopy (XAS) and X-PEEM spectro-microscopy on the DEIMOS and HERMES beamlines of synchrotron SOLEIL.

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