Bias voltage dependence of the magnetoresistance in ballistic vacuum tunneling: Theory and application to planar<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Co</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mn>0001</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>junctions

Henk, Jürgen; Bruno, P.

doi:10.1103/physrevb.68.174430

Cited by 7 publications

(1 citation statement)

References 34 publications

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“…screened KKR or layer KKR) [4][5][6]. These methods were successfully applied to a variety of problems (without any claim of completeness we refer to references [7][8][9][10][11][12][13][14]).…”

Section: Introductionmentioning

confidence: 99%

Computing conductances of tunnel junctions by the Korringa–Kohn–Rostoker method: formulation and test of a Green function approach

Henk

Ernst

Saha

et al. 2006

J. Phys.: Condens. Matter

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An approach to computing conductances of tunnel junctions within the framework of the Landauer-Büttiker theory for electronic transport is introduced and formulated for the Korringa-Kohn-Rostoker (KKR) method for electronic-structure calculations. After a general introduction to the idea behind the approach, tests and comparisons with other methods, namely a 'transmission of Bloch-waves' approach and an approach based on the Kubo-Greenwood formula for the conductivity tensor, reveal a high accuracy and robustness of the proposed method, thus proving its suitability for state-of-the-art computations of spin-dependent ballistic transport. Based on Green functions, it is flexible and can easily be implemented in present KKR computer codes.

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Section: Introductionmentioning

confidence: 99%

Computing conductances of tunnel junctions by the Korringa–Kohn–Rostoker method: formulation and test of a Green function approach

Henk

Ernst

Saha

et al. 2006

J. Phys.: Condens. Matter

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High tunnel magnetoresistance in spin-polarized scanning tunneling microscopy of Co nanoparticles on Pt(111)

Rusponi

Weiss

Cren

et al. 2005

Applied Physics Letters

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We employ variable-temperature spin-polarized scanning tunneling microscopy in constant current mode to read the magnetic state of monodomain cobalt nanoparticles on Pt 111 . In order to avoid stray fields we use in situ prepared antiferromagnetically Cr coated W tips. The contrast in apparent height between nanoparticles with opposite magnetization is typically z = 0.20± 0.05 Å, but can reach up to 1.1 Å, indicating 80% spin-polarization of the nanoparticles and 850% magnetoresistance of the tip-sample tunnel junction with tip and sample at 300 K and 160 K, respectively. There is no zero-bias anomaly. These results suggest state-selective tunneling which is expected to lead to very high magnetoresistance values.

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First-principles methodology for quantum transport in multiterminal junctions

Saha

Bernholc

et al. 2009

The Journal of Chemical Physics

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We present a generalized approach for computing electron conductance and I-V characteristics in multiterminal junctions from first-principles. Within the framework of Keldysh theory, electron transmission is evaluated employing an O(N) method for electronic-structure calculations. The nonequilibrium Green function for the nonequilibrium electron density of the multiterminal junction is computed self-consistently by solving Poisson equation after applying a realistic bias. We illustrate the suitability of the method on two examples of four-terminal systems, a radialene molecule connected to carbon chains and two crossed carbon chains brought together closer and closer. We describe charge density, potential profile, and transmission of electrons between any two terminals. Finally, we discuss the applicability of this technique to study complex electronic devices.

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Bias voltage dependence of the magnetoresistance in ballistic vacuum tunneling: Theory and application to planarCo(0001)junctions

Cited by 7 publications

References 34 publications

Computing conductances of tunnel junctions by the Korringa–Kohn–Rostoker method: formulation and test of a Green function approach

Computing conductances of tunnel junctions by the Korringa–Kohn–Rostoker method: formulation and test of a Green function approach

High tunnel magnetoresistance in spin-polarized scanning tunneling microscopy of Co nanoparticles on Pt(111)

First-principles methodology for quantum transport in multiterminal junctions

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