Regensburg 2010 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 4: Multiferroics I (Joint Session of MA, DF, KR, DS)
DF 4.2: Vortrag
Montag, 22. März 2010, 10:45–11:00, H3
Magnetic phase transition at a biferroic interface predicted from first principles — •Michael Fechner1, Igor Maznichenko2, Sergey Ostanin1, Arthur Ernst1, Jürgen Henk1, and Ingrid Mertig1,2 — 1MPI für Mikrostrukturphysik Halle, Germany — 2Fachgruppe Theoretische Physik, Martin-Luther-Universität Halle-Wittenberg
The interface magnetoelectric effect mediates the change of the magnetization at a ferromagnetic/ferroelectric interface when the electric polarization is modified. Using first principle methods, we investigate different ultrathin ferromagnetic films (Co and Fe) on top of ferroelectric ATiO3 (A=Pb,Ba) perovskites upon the occurrence of it. The calculations show that at the interface a moderately change of the size of the total magnetization takes place [1]. Further the magnetic ordering of the Fe film is sensitive to its thickness, so an unexpected antiferrimagnetic ordering appears for 2ML Fe whereas for all other thicknesses ferromagnetic ordering is preferred. Hybridization and strain effects at the interface can explain all observations. An interesting perspective for further studies will be the investigation of thin films of a CoFe alloy. This may allow gaining control of the magnetic ordering by the electric polarization.
[1] Fechner et al.. PRB 78, 212406(2008)