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Sujet de stage / Master 2 Internship

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Study of embedded ferrite – perovskite type multiferroic microstructures

Contact: BARBIER Antoine , , antoine.barbier@cea.fr, +33 1 69 08 39 23
Summary:
The objective of the internship is to realize and characterize ferrimagnetic ferrite inclusions (CoFe2O4) in a ferroelectric perovskite matrix (BaTiO3). The realization of the samples will benefit from the expertise gained in recent years, in the laboratory, in growing thin films of such compounds by molecular beam epitaxy. The study will be completed by advanced methods using synchrotron radiation.
Possibility of continuation in PhD: Oui
Deadline for application:27/04/2018

Full description:
The magneto-electric coupling between ferroelectric and ferro, ferri or antiferro-magnetic oxides is of current 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 of 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. The cobalt ferrite has many advantages like high Curie temperature and high magnetostriction constant. The inclusion of CoFe2O4 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 laboratory. The deposits will be realized by molecular beam epitaxy assisted by atomic oxygen plasma. Within the internship the conditions of realization of encapsulated inclusions will be determined. These samples will then be studied on beamlines DIFFABS and HERMES at synchrotron SOLEIL to determine respectively the crystalline properties and the chemical mapping as well as the magnetic and ferroelectric orders.

The layers developed during this internship belong to 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 and co-financing between the laboratory CEA / SPEC and synchrotron SOLEIL beamlines (DIFFABS and HERMES lines).
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. We will use Reflexion High Energy Electron Diffraction (RHEED), Auger Electron Spectroscopy (AES), Photoemission core level spectroscopy (XPS), Piezo Force Microscopy (PFM), X-ray diffraction on the DIFFABS beamline, Low Energy Electron microscopy (LEEM), X-ray absorption spectroscopy (XAS) and X-PEEM spectro-microscopy on the HERMES beamline of synchrotron SOLEIL.

Laboratory
Tutor of the internship

 

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