Effect of interface states on spin-dependent tunneling in Fe/MgO/Fe tunnel junctions
نویسندگان
چکیده
Effect of interface states on spin-dependent tunneling in Fe/MgO/ Fe tunnel junctions" (2005).
منابع مشابه
ترابرد الکتریکی وابسته به اسپین در ساختارهای نامتجانس Fe-MgO-Fe
In this paper, spin-dependent electrical transport properties are investigated in a single-crystal magnetic tunnel junction (MTJ) which consists of two ferromagnetic Fe electrodes separated by an MgO insulating barrier. These properties contain electric current, spin polarization and tunnel magnetoresistance (TMR). For this purpose, spin-dependent Hamiltonian is described for Δ1 and Δ5 bands in...
متن کاملSpin-dependent resonant tunneling through quantum-well states in magnetic metallic thin films.
Quantum-well (QW) states in nonmagnetic metal films between magnetic layers are known to be important in spin-dependent transport, but QW states in magnetic films remains elusive. Here we identify the conditions for resonant tunneling through QW states in magnetic films and report first principles calculations of Fe/MgO/FeO/Fe/Cr and Co/MgO/Fe/Cr. We show that, at resonance, the current increas...
متن کاملReversal of spin polarization in Fe/GaAs (001) driven by resonant surface states: first-principles calculations.
A minority-spin resonant state at the Fe/GaAs(001) interface is predicted to reverse the spin polarization with the voltage bias of electrons transmitted across this interface. Using a Green's function approach within the local spin-density approximation, we calculate the spin-dependent current in a Fe/GaAs/Cu tunnel junction as a function of the applied bias voltage. We find a change in sign o...
متن کاملInterfacial resonance state probed by spin-polarized tunneling in epitaxial Fe/MgO/Fe tunnel junctions.
The direct impact of the electronic structure on spin-polarized transport has been experimentally proven in high-quality Fe/MgO/Fe epitaxial magnetic tunnel junctions, with an extremely flat bottom Fe/MgO interface. The voltage variation of the conductance points out the signature of an interfacial resonance state located in the minority band of Fe(001). When coupled to a metallic bulk state, t...
متن کاملSpin-polarized electron tunneling in bcc FeCo/MgO/FeCo(001) magnetic tunnel junctions.
In combining spin- and symmetry-resolved photoemission, magnetotransport measurements and ab initio calculations we detangled the electronic states involved in the electronic transport in Fe(1-x)Co(x)(001)/MgO/Fe(1-x)Co(x)(001) magnetic tunnel junctions. Contrary to previous theoretical predictions, we observe a large reduction in TMR (from 530 to 200% at 20 K) for Co content above 25 atomic% a...
متن کامل