Extended Hückel theory for quantum transport in magnetic tunnel junctions

Author

Shine, Gautam ; Manipatruni, Sasikanth ; Chaudhry, Amita ; Saraswat, Krishna C. ; Nikonov, Dmitri E. ; Young, Ian A.

Author_Institution

Dept. of Electr. Eng., Stanford Univ., Stanford, CA, USA

fYear

2014

fDate

9-11 Sept. 2014

Firstpage

301

Lastpage

304

Abstract

Spin-resolved conductivities in magnetic tunnel junctions are calculated using a semiempirical tight-binding model and non-equilibrium Green´s functions. The performance of half-metallic electrodes is studied by comparing conventional Fe-MgO-Fe structures to Co₂FeAl-MgO-Co₂FeAl structures. The results show higher tunneling magnetoresistance and resistance-area product for Co₂FeAl devices across a wide bias range.

Keywords

EHT calculations; Green´s function methods; aluminium alloys; cobalt alloys; electrodes; iron alloys; magnesium compounds; magnetic devices; tunnelling magnetoresistance; Co₂FeAl; Co₂FeAl-MgO-Co₂FeAl; Fe-MgO-Fe; extended Huckel theory; half-metallic electrodes; magnetic tunnel junctions; nonequilibrium Green´s functions; quantum transport; resistance-area product; semiempirical tight-binding model; spin-resolved conductivities; tunneling magnetoresistance; Electrodes; Green´s function methods; Iron; Magnetic tunneling; Tunneling magnetoresistance;

fLanguage

English

Publisher

ieee

Conference_Titel

Simulation of Semiconductor Processes and Devices (SISPAD), 2014 International Conference on

Conference_Location

Yokohama

ISSN

1946-1569

Print_ISBN

978-1-4799-5287-8

Type

conf

DOI

10.1109/SISPAD.2014.6931623

Filename

6931623