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Lecture W. Eerenstein

Rooster

WanneerWaar
21 oktober 2005 FWN-Building 5118.-156, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. W. Eerenstein
Affiliation: Department of Materials Science, University of Cambridge, UK
Title: Multiferroic and magnetoelectric materials
Date: Fri Oct 21, 2005
Start: 09.30
Location: FWN-Building 5118.-156
Host: B. Noheda
Telephone: +31 50 363 4565

Abstract

Materials that are both ferromagnetic and ferroelectric are called multiferroics. Materials with coupled magnetic and ferroelectric properties are called magnetoelectrics. Multiferroics are expected to be magnetoelectric and therefore it is possible to address the magnetisation with an electric field, or the ferroelectric polarisation with a magnetic field. As these materials are rare, magnetoelectric effects have only been studied in a few materials and therefore present an exciting challenge. In this talk, I will concentrate on two candidate materials: BiFeO3 (an antiferromagnetic ferroelectric) and BiMnO3 (a ferromagnetic ferroelectric). Thin film growth conditions need careful tuning and will be discussed. Recently, thin films of BiFeO3 were claimed to be ferromagnetic due to epitaxial strain but I will show that this is not the case. Therefore BiMnO3 remains one of the very few single phase multiferroic materials, and I will report the first measurements of strong magnetoelectric coupling effects.

 

Laatst gewijzigd:22 oktober 2012 14:31