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    Perpendicular magnetic anisotropy in Ta|Co40Fe40B20|MgAl2O4 structures and perpendicular CoFeB|MgAl2O4|CoFeB magnetic tunnel junction

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    Type
    Article
    Authors
    Tao, B. S.
    Li, D. L.
    Yuan, Z. H.
    Liu, H. F.
    Ali, S. S.
    Feng, J. F.
    Wei, H. X.
    Han, X. F.
    Liu, Y.
    Zhao, Y. G.
    Zhang, Q.
    Guo, Zaibing
    Zhang, Xixiang cc
    KAUST Department
    Advanced Nanofabrication and Thin Film Core Lab
    Physical Sciences and Engineering (PSE) Division
    Materials Science and Engineering Program
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Date
    2014-09-08
    Permanent link to this record
    http://hdl.handle.net/10754/346747
    
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    Abstract
    Magnetic properties of Co40Fe40B20(CoFeB) thin films sandwiched between Ta and MgAl2O4layers have been systematically studied. For as-grown state, Ta/CoFeB/MgAl2O4structures exhibit good perpendicular magnetic anisotropy (PMA) with interface anisotropy Ki=1.22erg/cm2, which further increases to 1.30erg/cm2after annealing, while MgAl2O4/CoFeB/Ta multilayer shows in-plane magnetic anisotropy and must be annealed in order to achieve PMA. For bottom CoFeB layer, the thickness window for PMA is from 0.6 to 1.0nm, while that for top CoFeB layer is between 0.8 and 1.4nm. Perpendicular magnetic tunnel junctions (p-MTJs) with a core structure of CoFeB/MgAl2O4/CoFeB have also been fabricated and tunneling magnetoresistance ratio of about 36% at room temperature and 63% at low temperature have been obtained. The intrinsic excitations in the p-MTJs have been identified by inelastic electron-tunneling spectroscopy.
    Citation
    Perpendicular magnetic anisotropy in Ta|Co40Fe40B20|MgAl2O4 structures and perpendicular CoFeB|MgAl2O4|CoFeB magnetic tunnel junction 2014, 105 (10):102407 Applied Physics Letters
    Publisher
    AIP Publishing
    Journal
    Applied Physics Letters
    ISSN
    0003-6951
    1077-3118
    DOI
    10.1063/1.4895671
    Additional Links
    http://scitation.aip.org/content/aip/journal/apl/105/10/10.1063/1.4895671
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4895671
    Scopus Count
    Collections
    Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

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