Article ID Journal Published Year Pages File Type
8155107 Journal of Magnetism and Magnetic Materials 2016 6 Pages PDF
Abstract
We investigate the magnetoelectric coupling and spin-polarized tunneling in Ni/KNbO3/Ni multiferroic tunnel junctions with asymmetric interfaces based on density functional theory. The junctions have two stable polarization states. We predict a peculiar magnetoelectric effect in such junctions originating from the magnetic reconstruction of Ni near the KO-terminated interface. This reconstruction is induced by the reversal of the ferroelectric polarization of KNbO3. Furthermore, the change in the magnetic ordering filters the spin-dependent current. This effect leads to a change in conductance by about two orders of magnitude. As a result we obtain a giant tunneling electroresistance effect. In addition, there exist sizable tunneling magnetoresistance effects for two polarization states.
Related Topics
Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
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