Spin-polarized ballistic transport channel in a thin superlattice composed of zincblende half-metallic compounds

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The authors examine theoretically conduction processes near the Fermi energy of thin layers of zincblende structure half metals, using as an example a superlattice consisting of monolayers of GaAs and MnAs, a bilayer of CrAs, and a bilayer of GaAs. By artificially separating bilayers, they show that non-fourfold coordinated Cr states thwart half metallicity. However, capping the metal-As bilayers restores half metallicity and ballistic conduction of electrons around 0.3 eV above the Fermi level will give nearly 100% spin-polarized transmission in the direction of the thin superlattice. Recent developments suggest atomic layer epitaxy can be used to produce such thin ... continued below

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Qian, M C; Fong, C Y; Pickett, W E; Yang, L H; Pask, J E & Dag, S May 11, 2004.

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The authors examine theoretically conduction processes near the Fermi energy of thin layers of zincblende structure half metals, using as an example a superlattice consisting of monolayers of GaAs and MnAs, a bilayer of CrAs, and a bilayer of GaAs. By artificially separating bilayers, they show that non-fourfold coordinated Cr states thwart half metallicity. However, capping the metal-As bilayers restores half metallicity and ballistic conduction of electrons around 0.3 eV above the Fermi level will give nearly 100% spin-polarized transmission in the direction of the thin superlattice. Recent developments suggest atomic layer epitaxy can be used to produce such thin layers for spintronics applications.

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PDF-file: 6 pages; size: 0.9 Mbytes

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  • Journal Name: Physical Review B, vol. 71, N/A, January 24, 2005, pp. 012414; Journal Volume: 71

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  • Report No.: UCRL-JRNL-204147
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 907847
  • Archival Resource Key: ark:/67531/metadc880381

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  • May 11, 2004

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 7, 2016, 9:35 p.m.

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Qian, M C; Fong, C Y; Pickett, W E; Yang, L H; Pask, J E & Dag, S. Spin-polarized ballistic transport channel in a thin superlattice composed of zincblende half-metallic compounds, article, May 11, 2004; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc880381/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.