Tunnel junctions with a ferroelectric-ferromagnetic composite barrier

Jian Wang; Li, Z. Y.
September 2008
Applied Physics Letters;9/15/2008, Vol. 93 Issue 11, p112501
Academic Journal
A theoretical model for a tunnel junction with a ferroelectric-ferromagnetic (insulator) composite barrier separating two metallic electrodes is proposed. By using free electron direct quantum tunneling method and transfer matrix formalism, taking into account screening of polarization charges in metallic electrodes and dielectric response in ferromagnetic barrier, we investigate the spin filtering (SF) effect, tunneling magnetoresistance (TMR), and electroresistance (TER) effects in the junction. It is shown that the large SF effect, hence TMR and TER effects, can be achieved. Eight resistive states in the junction can also be realized by the reversal of electric polarization in the ferroelectric layer and magnetization either in the ferromagnetic layer or in the electrodes.


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