Laboratoire Léon Brillouin

UMR12 CEA-CNRS, Bât. 563 CEA Saclay

91191 Gif sur Yvette Cedex, France

+33-169085241 llb-sec@cea.fr

Let's scatter neutrons

PhD subjects

1 sujet IRAMIS//LLB

Dernière mise à jour : 17-09-2019


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• Solid state physics, surfaces and interfaces

 

Linear magnetoelectric and multiferroic properties in A4A’2O9 antiferromagnets

SL-DRF-19-0539

Research field : Solid state physics, surfaces and interfaces
Location :

Laboratoire Léon Brillouin

Groupe Diffraction Poudres

Saclay

Contact :

Françoise Damay

Starting date : 01-10-2019

Contact :

Françoise Damay
CEA - DRF/IRAMIS/LLB/GDP

0169084954

Thesis supervisor :

Françoise Damay
CEA - DRF/IRAMIS/LLB/GDP

0169084954

Personal web page : http://iramis.cea.fr/Pisp/francoise.damay/

Laboratory link : http://www-llb.cea.fr/

The general context of this PhD work is the search for new multiferroics, compounds in which magnetisation and electric polarization are coupled, allowing for instance a magnetic field to modify the polarization, of an electric field to change magnetization.



In the proposed work, a new family of promising multiferroics will be investigated, namely niobiates and tantalates of general formula A4A'O9 with A a divalent transition metal. In work published in 2018, it was shown that in particular Fe4Ta2O9 exhibits both multiferroic and linear magneto-electric properties, depending on the temperature range. This suggests different spin/charge couplings that remain to be explored and understood. Experimental techniques will be devoted to the understanding of the relations ships between crystal and magnetic structures and physical properties: for the most part, the student will deal with magnetization, dielectric constant and polarization measurements, coupled with X-ray and neutron diffraction experiments versus temperature.

 

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