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Applied Physics Letters / Volume 95 / Issue 19 / ELECTRONIC TRANSPORT AND SEMICONDUCTORS

Appl. Phys. Lett. 95, 192104 (2009); http://dx.doi.org/10.1063/1.3259646 (3 pages)

Highly efficient (Cs8V) superatom-based spin-polarizer

Haiying He1, Ravindra Pandey1, J. Ulises Reveles2, Shiv N. Khanna2, and Shashi P. Karna3

1Department of Physics and Multi-Scale Technologies Institute, Michigan Technological University, Houghton, Michigan 49931, USA
2Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284-2000, USA
3Weapons and Materials Research Directorate, U.S. Army Research Laboratory, ATTN: AMSRD-ARL-WM, Aberdeen Proving Ground, Maryland 21005-5069, USA

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(Received 28 August 2009; accepted 11 October 2009; published online 10 November 2009)

Quantum transport through molecules and the possibility to manipulate spin has generated tremendous excitement. Here, we demonstrate unusual spin transport through a molecule of two Cs8V magnetic superatoms. Calculations based on density functional theory and nonequilibrium Green’s function methods find a much higher current for the spin-down charge carriers relative to the spin-up carriers in the model Au–(Cs8V)–(Cs8V)–Au device system with almost 100% spin polarization, indicating a highly efficient spin polarizer. The new behavior is rooted in strong coupling of the localized magnetic core on V and the itinerant electrons of the Cs shell atoms leading to nearly full spin polarization.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

caesium alloys, density functional theory, gold, Green's function methods, spin polarised transport, vanadium alloys

PACS

  • 73.40.Jn

    Metal-to-metal contacts

  • 72.25.Ba

    Spin polarized transport in metals

  • 72.25.Mk

    Spin transport through interfaces

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3259646

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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