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KR: Fachgruppe Kristallographie

KR 4: Multiferroics I (MA jointly with DF, DS, KR, TT)

KR 4.1: Vortrag

Dienstag, 1. April 2014, 09:30–09:45, BEY 118

Ab initio study of electronic transport in the Co/PZT-based tunnel junctions — •Vladislav Borisov¹, Sergey Ostanin¹, Igor Maznichenko², Arthur Ernst¹, and Ingrid Mertig^1,2 — ¹Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany — ²Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany

Magnetoelectric coupling at the multiferroic interfaces FM/FE (FM=Co,Fe, FE=PbTiO₃,PZT) was studied from first principles. The magnetic interfacial effect, which is controlled by the FE polarization, originates from the charge transfer and d-orbital redistribution of Co/Fe and Ti mediated by the p-states of interfacial oxygens. In PZT, the presence of Zr dopants may locally enhance the effect. We analysed also the spin polarization of tunneling electrons in Co/PTO/Co and Fe/PTO/Co junctions, in which the calculated four-state conductance can account for the ferroelectrically switchable TMR signal observed recently in LSMO/PZT/Co [1].

[1] D. Pantel et al., NATURE MATERIALS 11, 289 (2012).