Theory of surface-induced multiferroicity in magnetic materials, thin films, and multilayers
journal contributionposted on 03.08.2021, 09:07 authored by Ahmed TarkhanyAhmed Tarkhany, Marco DiscacciatiMarco Discacciati, Joseph BetourasJoseph Betouras
We present a theoretical study of the onset of electric polarization close to a surface in magnetic materials and in thin films and multilayers. We consider two different paths that lead to the onset of multiferroic behavior at the boundary in materials that are bulk collinear ferromagnets (or even antiferromagnets). These two paths are distinguished by the presence or absence of a surface-induced Dzyaloshinskii-Moriya interaction, which can be taken into account through Lifshitz invariants in the free energy of the system. Experimental consequences are discussed in light of the developed theory.
Regional Government of Kurdistan-Iraq
EPSRC Grant No. EP/P003052/1
EPSRC Grant No. EP/R014604/1
- Mathematical Sciences