scholarly journals Spin-polarized Josephson and quasiparticle currents in superconducting spin-filter tunnel junctions

2012 ◽  
Vol 86 (6) ◽  
Author(s):  
F. Sebastian Bergeret ◽  
Alvise Verso ◽  
Anatoly F. Volkov
Keyword(s):  
Tunnel Junctions ◽  
Spin Filter ◽  
Spin Polarized

Spin splitting in EuO(111)/Si(111) spin-filter tunnel junctions with atomically sharp interface

2018 ◽  
Vol 57 (11) ◽  
pp. 110304 ◽  
Author(s):  
Rento Ohsugi ◽  
Hiroo Omi ◽  
Yoshiharu Krockenberger ◽  
Akira Fujiwara
Keyword(s):  
Tunnel Junctions ◽  
Sharp Interface ◽  
Spin Splitting ◽  
Spin Filter

Current hysteresis due to changes in magnetization of magnetic tunnel junctions by spin-polarized current

2001 ◽  
Vol 53 (5) ◽  
pp. 625-631 ◽  
Author(s):  
A. M Baranov ◽  
A. I Chmil ◽  
R. J Elliott ◽  
L. A Feigin ◽  
Yu. V Gulyaev ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Spin Polarized

Non-Equilibrium Green’s Function Modeling of the Transport Characteristics of Magnetic Tunnel Junctions Containing Anderson Impurities

SPIN ◽  
2020 ◽  
Vol 10 (01) ◽  
pp. 2050006
Author(s):  
Parvathy Harikumar ◽  
S. Mathi Jaya
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Tunnel Junctions ◽  
Magnetic Tunnel Junctions ◽  
Many Body ◽  
Applied Bias ◽  
Tunnel Current ◽  
Spin Polarized ◽  
Barrier Region ◽  
Non Equilibrium Green’S Function

A nonequilibrium Green’s function (NEGF) formulation to study the transport characteristics of magnetic tunnel junctions (MTJs) that contains impurities at the barrier region and many-body interaction at the electrode region is presented. The formulation makes use of the already developed NEGF method for MTJs without any impurities and the impurity Green’s function is obtained using Haldane’s approach that explicitly takes into account the on-site Coulomb interaction ([Formula: see text]) of the impurity. The formulation is used to obtain the spin-dependent tunnel current of model MTJs as a function of the applied bias for different values of [Formula: see text] corresponding to both the parallel and antiparallel configuration of the end electrodes of the MTJ. The tunnel currents are used to obtain the tunnel magnetoresistance (TMR) of the MTJ and we observed from our study that the TMR is strongly influenced by the impurities. The TMR is found to be reduced compared to that of the MTJ without impurities and the bias dependence of the TMR is found to be strongly influenced by [Formula: see text]. Our studies revealed that the MTJ can exhibit almost completely spin polarized current at certain values of [Formula: see text].

Perfect spin-filter devices based on zigzag zinc oxide nanoribbons

2016 ◽  
Vol 30 (32n33) ◽  
pp. 1650392 ◽  
Author(s):  
Zi-Yue Zhang
Keyword(s):  
Zinc Oxide ◽  
Electron Transport ◽  
Spin Polarization ◽  
Bias Voltage ◽  
First Principles ◽  
External Fields ◽  
Spin Filter ◽  
Spin Polarized ◽  
Spin Filters ◽  
Filtering Effect

Spin-polarized electron transport through a zigzag zinc oxide nanoribbon (ZnONR) has been studied using first-principles transport simulations. Ribbons without edges passivated show 100% spin polarization at small bias voltage independently of width. The ribbons with edge zinc atoms passivated maintain absolute spin-filtering effect in much larger bias region. The results demonstrate that zigzag ZnONRs act as perfect spin-filters in the absence of magnetic electrodes and external fields.

scholarly journals Spin-Polarized Electron Tunneling in bccFeCo/MgO/FeCo(001)Magnetic Tunnel Junctions

2012 ◽  
Vol 108 (17) ◽  
Author(s):  
F. Bonell ◽  
T. Hauet ◽  
S. Andrieu ◽  
F. Bertran ◽  
P. Le Fèvre ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Electron Tunneling ◽  
Magnetic Tunnel Junctions ◽  
Spin Polarized
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