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Kovàcs, Andras
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article
Structure of epitaxial L10-FePt/MgO perpendicular magnetic tunnel junctions
Abstract
<p>Perpendicular magnetic tunnel junctions (p-MTJs) with MgO barriers are interesting for high-density information-storage devices. Chemically ordered L1<sub>0</sub>-FePt is a potential electrode due to its large perpendicular magnetocrystalline anisotropy. To-date, a single theoretical study on L1 <sub>0</sub>-FePt/MgO p-MTJ based on an idealized structure reported significant dependence of spin-dependent tunneling on interface structure. [Y. Taniguchi, IEEE Trans. Magn. 44, 2585 (2008).] We report a structural study of epitaxial L1<sub>0</sub>-FePt(001)[110]//MgO(001)[110]//L1<sub>0</sub>-FePt(001)[110] p-MTJs, focusing on the interfaces using aberration-corrected scanning transmission electron microscopy. Interfaces are semi-coherent, with oxygen atomic-columns of MgO located opposite to iron atomic-columns in L1 <sub>0</sub>-FePt. Up to three lattice planes show atomic-column steps, the origin of which is attributed to antiphase boundaries in L1<sub>0</sub>-FePt.</p>