Perpendicular magnetic anisotropy at lattice-matched Co2FeAl/MgAl2O4(001) epitaxial interfaces

Hiroaki Sukegawa, Jason Paul Hadorn, Zhenchao Wen, Tadakatsu Ohkubo, Seiji Mitani, Kazuhiro Hono

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Abstract

We report perpendicular magnetic anisotropy (PMA) induced at Co2FeAl/MgAl2O4(001) epitaxial interfaces prepared by magnetron sputtering and post-oxidation of MgAl layers. A PMA energy density of more than 4 Merg/cm3 for 1-nm-thick Co2FeAl layers and an effective interface PMA energy density of 1.6 erg/cm2 were achieved by controlling the interfacial oxidation states through fine-tuning of oxidation processes and annealing temperature. Cross-sectional scanning transmission electron microscopy imaging revealed a lattice-matched Co2FeAl/MgAl2O4 interface, which may be responsible for the large PMA energy due to a reduction of the bulk anisotropy contribution.

Original languageEnglish
Article number112403
JournalApplied Physics Letters
Volume110
Issue number11
DOIs
Publication statusPublished - 2017 Mar 13

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Sukegawa, H., Hadorn, J. P., Wen, Z., Ohkubo, T., Mitani, S., & Hono, K. (2017). Perpendicular magnetic anisotropy at lattice-matched Co2FeAl/MgAl2O4(001) epitaxial interfaces. Applied Physics Letters, 110(11), [112403]. https://doi.org/10.1063/1.4978663