Large Spatial Spin Polarization at Benzene/La_2/3Sr_1/3MnO₃ Spinterface: Toward Organic Spintronic Devices

Abstract

The fascinating spinterfaces between benzene and La2/3Sr1/3MnO3 (LSMO) are investigated based on the first-principles calculations. LSMO is a traditional high spin-polarized material used as the electrode in organic spintronic devices. However, the understanding of spin characteristics at organic/LSMO interfaces is unclear. Therefore, we study the benzene/LSMO spinterfaces to clarify the spin behaviors at organic/LSMO interfaces because benzene is the basic unit of organic molecules. It is found that SrO terminations have weak binding with benzene, showing the inert properties. More importantly, the positive spatial spin polarization expands into the benzene layer and vacuum layer in all of the models. To further make sure the credibility of the results, both the effect of the ordering of Sr atoms and the adsorption density of benzene are considered in our calculations. There is no spatial spin-polarization inversion above the benzene plane in all of the models. The results indicate that the organic layer can carry large spin polarization at organic/LSMO spinterfaces.