Structure of epitaxial L10-FePt/MgO perpendicular magnetic tunnel junctions

Amit Kohn, Nadav Tal, Ayala Elkayam, Andras Kovàcs, Dalai Li, Shouguo Wang, Saman Ghannadzadeh, Thorsten Hesjedal, Roger C.C. Ward

Research output: Contribution to journalArticlepeer-review

Abstract

Perpendicular magnetic tunnel junctions (p-MTJs) with MgO barriers are interesting for high-density information-storage devices. Chemically ordered L10-FePt is a potential electrode due to its large perpendicular magnetocrystalline anisotropy. To-date, a single theoretical study on L1 0-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 L10-FePt(001)[110]//MgO(001)[110]//L10-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 0-FePt. Up to three lattice planes show atomic-column steps, the origin of which is attributed to antiphase boundaries in L10-FePt.

Original languageEnglish
Article number062403
JournalApplied Physics Letters
Volume102
Issue number6
DOIs
StatePublished - 11 Feb 2013
Externally publishedYes

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