Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8155107 | Journal of Magnetism and Magnetic Materials | 2016 | 6 Pages |
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
Authors
Hu Zhang, Jian-Qing Dai, Yu-Min Song,