Large perpendicular magnetic anisotropy in epitaxial Fe/MgAl2O4(001) heterostructures

Qingyi Xiang, Ruma Mandal, Hiroaki Sukegawa, Yukiko K. Takahashi, Seiji Mitani

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12 Citations (Scopus)

Abstract

We investigated the perpendicular magnetic anisotropy (PMA) and related properties of epitaxial Fe (0.7 nm)/MgAl2O4(001) heterostructures prepared by electron beam evaporation. Using an optimized structure, we obtained a large PMA energy of ∼1MJ/m3 at room temperature, which is comparable to that in ultrathin-Fe/MgO(001) heterostructures. Both the PMA energy and saturation magnetization showed a weak temperature dependence, ensuring a wide working temperature range in applications. The effective magnetic damping constant of the 0.7nm Fe layer was found to be ∼0.02 using the time-resolved magneto-optical Kerr effect. This study demonstrated the suitability of the Fe/MgAl2O4 heterostructure for use in perpendicular magnetic tunnel junctions, as well as good agreement with theoretical predictions.

Original languageEnglish
Article number063008
JournalApplied Physics Express
Volume11
Issue number6
DOIs
Publication statusPublished - 2018 Jun
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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