Multifunctional devices based on multiferroic BiFeO3 thin films
Jeudi 5 février 2015 16:00
- Duree : 1 heure
Lieu : SPINTEC, Bât 10-05 - salle 434, CEA Grenoble, 17 rue des martyrs
Orateur : Manu BIBES (CNRS/Thales Lab, Palaiseau in Spintec)
BiFeO3 is a one of the very few room-temperature multiferroic materials [1]. Its rediscovery ten years ago was initially motivated by its possible application in electric-field controlled spintronics devices [2]. Other important properties of BiFeO3 are its remarkable spontaneous polarization of 100 μC/cm² in the <111> pseudocubic direction, high Curie temperature of 1100 K, cycloidal spin order in the bulk, and the sensitivity of its structural and multiferroic properties to epitaxial strain. In addition BiFeO3 exhibits interesting optical characteristics, such as a band gap in the visible range (2.7 eV [3,4]) a large birefringence [5] as well as weak absorption at 1.55 μm, a wavelength that is relevant for telecommunications.
In this talk, we will present examples of devices in various application fields, all based on BiFeO3. We will notably report a joint experimental and theoretical study of the electro-optic effect in multiferroic BiFeO3 thin films and devices. We will also discuss the implementation of T-like BiFeO3 in epitaxial field effect transistors based on Mott insulator channels [6] and as tunnel barriers in memristive ferroelectric tunnel junctions [7]. Finally, we will show how BiFeO3’s various functional properties can be tuned by epitaxial strain, opening the way toward devices that would simultaneously exploit charge, spin and optical degrees of freedom.
[1] D. Sando, A. Barthélémy and M. Bibes, J. Phys. Condens. Matter. , 473201 (2014)
[2] H. Béa, M. Gajek, M. Bibes, and A. Barthélémy, J. Phys. Condens. Matter , 434221 (2008).
[3] A. Kumar et al, Appl. Phys. Lett. , 121915 (2008).
[4] J. Allibe et al, Appl. Phys. Lett. , 182902 (2010).
[5] J.-P. Rivera and H. Schmid, Ferroelectrics , 23 (1997).
[6] H. Yamada et al, Sci. Rep. , 2834 (2013).
[7] H. Yamada et al, ACS Nano , 5385 (2013).
Contact : olivier.boulle@cea.fr
Discipline évènement : (Physique)
Nature évènement : (Séminaire)
Site de l'évènement : Site CEA avec accès badge
Prévenir un ami par email
Télécharger dans mon agenda