Effect of Mg interlayer on perpendicular magnetic anisotropy of CoFeB films in MgO/Mg/CoFeB/Ta structure

Q. L. Ma, S. Iihama, T. Kubota, X. M. Zhang, S. Mizukami, Y. Ando, T. Miyazaki

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38 Citations (Scopus)

Abstract

The effects of Mg metallic interlayer on the magnetic properties of thin CoFeB films in MgO/Mg (t Mg) / CoFeB (1.2 nm)/Ta structures were studied in this letter. Our experimental result shows that the CoFeB film exhibits perpendicular magnetic anisotropy (PMA) when the CoFeB and MgO layers are separated by a metallic Mg layer with a maximum thickness of 0.8 nm. The origin of PMA was discussed by considering the preferential transmission of the Δ 1 symmetry preserved by the Mg interlayer in crystallized MgO/Mg/CoFeB/Ta. In addition, the thin Mg interlayer also contributes to enhancing the thermal stability and reducing the effective damping constant and coercivity of the CoFeB film.

Original languageEnglish
Article number122414
JournalApplied Physics Letters
Volume101
Issue number12
DOIs
Publication statusPublished - 2012 Sep 17

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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