First principles calculation of electrical conductivity and giant magnetroresistance of Co{vert_bar}Cu multilayers

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We show that the Kubo formula can be used to calculate the nonlocal electrical conductivity of layered systems from first principles. We use the Layer Korringa Kohn Rostoker method to calculate the electronic structure and Green function of Co/Cu/Co trilayers within the local density approximation to density functional theory. This Green function is used to calculate the conductivity through the Kubo formula for both majority and minority spins and for alignment and anti-alignment of the Co moments on either side of the Cu spacer layer. This allows us to determine the giant magnetoresistance from first principles. We investigate three possibilities ... continued below

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13 p.

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Butler, W.H.; Zhang, X.G.; Nicholson, D.M.C. & MacLaren, J.M. December 31, 1995.

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We show that the Kubo formula can be used to calculate the nonlocal electrical conductivity of layered systems from first principles. We use the Layer Korringa Kohn Rostoker method to calculate the electronic structure and Green function of Co/Cu/Co trilayers within the local density approximation to density functional theory. This Green function is used to calculate the conductivity through the Kubo formula for both majority and minority spins and for alignment and anti-alignment of the Co moments on either side of the Cu spacer layer. This allows us to determine the giant magnetoresistance from first principles. We investigate three possibilities for the scattering in Co/Cu/Co: (1) equal electron lifetimes for Cu, majority spin Co, and minority spin Co, (2) equal electron lifetimes for majority and minority Co, weaker scattering in Cu and spin dependent interfacial scattering, (3) electron lifetimes for majority and minority spin cobalt proportional to their Fermi energy densities of states and spin dependent interfacial scattering.

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13 p.

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OSTI as DE96005364

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  • Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 17-21 Apr 1995

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  • Other: DE96005364
  • Report No.: CONF-950412--62
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 212413
  • Archival Resource Key: ark:/67531/metadc670819

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Office of Scientific & Technical Information Technical Reports

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 22, 2016, 10:49 a.m.

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Butler, W.H.; Zhang, X.G.; Nicholson, D.M.C. & MacLaren, J.M. First principles calculation of electrical conductivity and giant magnetroresistance of Co{vert_bar}Cu multilayers, article, December 31, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc670819/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.