Chemical and magnetic interface properties of tunnel junctionswith co2mnsi/co2fesi multilayer electrode showing large tunnelingmagnetoresistance

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Transport, as well as chemical and magnetic interface properties of two kinds of magnetic tunnel junctions (MTJs) with Co{sub 2}FeSi electrode, Al-O barrier, and Co-Fe counter electrode, are investigated. For junctions with Co{sub 2}FeSi single-layer electrodes, a tunnel magnetoresistance of up to 52% is found after optimal annealing for an optimal Al thickness of 1.5 nm, whereas the room temperature bulk magnetization of the Co{sub 2}FeSi film reaches only 75% of the expected value. By using a [Co{sub 2}MnSi/Co{sub 2}FeSi]{sub x10} multilayer electrode, the magnetoresistance can be increased to 114%, corresponding to a large spin polarization of 0.74, and the ... continued below

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Schmalhorst, J.; Ebke, D.; Sacher, M.D.; Liu, N.; Thomas, A.; Reiss, G. et al. January 1, 2007.

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Transport, as well as chemical and magnetic interface properties of two kinds of magnetic tunnel junctions (MTJs) with Co{sub 2}FeSi electrode, Al-O barrier, and Co-Fe counter electrode, are investigated. For junctions with Co{sub 2}FeSi single-layer electrodes, a tunnel magnetoresistance of up to 52% is found after optimal annealing for an optimal Al thickness of 1.5 nm, whereas the room temperature bulk magnetization of the Co{sub 2}FeSi film reaches only 75% of the expected value. By using a [Co{sub 2}MnSi/Co{sub 2}FeSi]{sub x10} multilayer electrode, the magnetoresistance can be increased to 114%, corresponding to a large spin polarization of 0.74, and the full bulk magnetization is reached. For Al thickness smaller than 1 nm, the TMR of both kinds of MTJs decreases rapidly to zero. On the other hand, for 2- to 3-nm-thick Al, the TMR decreases only slowly. The Al thickness dependence of the TMR is directly correlated to the element-specific magnetic moments of Fe and Co at the Co{sub 2}FeSi/Al-O interface for all Al thickness. Especially, for optimal Al thickness and annealing, the interfacial Fe moment of the single-layer electrode is about 20% smaller than for the multilayer electrode, indicating smaller atomic disorder at the barrier interface for the latter MTJ.

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  • 10th Joint MMM/Intermag Conference, Baltimore,MD, January 7-11, 2007

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  • Report No.: LBNL--62705
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 927323
  • Archival Resource Key: ark:/67531/metadc896413

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  • January 1, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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Schmalhorst, J.; Ebke, D.; Sacher, M.D.; Liu, N.; Thomas, A.; Reiss, G. et al. Chemical and magnetic interface properties of tunnel junctionswith co2mnsi/co2fesi multilayer electrode showing large tunnelingmagnetoresistance, article, January 1, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc896413/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.