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Novel imaging spin-filter techniques, which are based on low energy electrondiffraction, are currently of high scientific interest. To improve thespin-detection efficiency a variety of new materials have been introduced inrecent years. A new class of promising spin-filter materials are represented bymultiferroic systems, as both magnetic and electric ordering exist in thesematerials. We have investigated Fe/BaTiO3(001), which defines a prominentcandidate due to its moderate spontaneous polarization, for spin filterapplications calculating diffraction patterns for spin polarized electronsincident on the Fe surface. Motivated by the fact that spin polarized lowenergy electron diffraction is a powerful method for the determination of theproperties of surfaces we investigated the influence of switching the BaTiO3polarization on the exchange and spin orbit scattering as well as onreflectivity and figure of merit. This system obviously offers the possibilityto realize a multiferroic spin filter and manipulating the spin-orbit andexchange scattering by an external electric field. The calculations have beendone for a large range of kinetic energies and polar angles of the diffractedelectrons considering different numbers of Fe monolayers.

Multiferroic heterostructures for spin filter application - an ab initio study