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Lecture Craig J. Fennie


03 mei 2007 FWN-Building 5118.-152, Nijenborgh 4, 9747 AG, Groningen
Speaker:Dr. Craig J. Fennie
Affiliation:Argonne National Laboratory
Title:Tailoring a huge mangnetoelectric response in epitaxial thin films from first principles
Date:Thu May 3, 2007
Location:FWN-Building 5118.-152
Host:T.T.M. Palstra
Telephone:+31 50 363 4419


Multifunctional materials have the ability to response in a useful way to several external stimuli and as such have tremendous potential for meeting the demands of emerging technological applications. Multiferroic oxides, which combine more than one ?ferro? property, e. ferroelectricity and ferromagnetism, are promising materials to achieve such responses. The key challenge in multiferroics is to produce a strong coupling between the magnetization M and polarization P, and thus increase functionality via a magnetoelectric response. A fruitful starting point for identifying such a mechanism is the observation that the basic physics of a strong coupling involves a competition between different ordered states, e. between a FM-FE state and an AFM-PE state. Recent advances in the vapor phase epitaxial growth of complex oxide thin films have provided a new route to achieve this competition by facilitating the application of large strains to a material, allowing properties to be tailored and enhanced. In this Talk, we present a new approach for designing a strongly coupled multiferroic in which the interplay of spins, optical phonons, and epitaxial strain leads to such a competition. We also present a first-principles calculation of the ground-state epitaxial phase diagram for the magnetic perovskite EuTiO3 demonstrating that this system is indeed a realization of our proposed mechanism for strongly coupled multiferroicity [1]. [1] C. and K. Rabe, PRL 97, 267602 (2006).
Laatst gewijzigd:22 oktober 2012 14:30