Nonlinear electric field effect on perpendicular magnetic anisotropy in Fe/MgO interfaces

Qingyi Xiang, Zhenchao Wen, Hiroaki Sukegawa, Shinya Kasai, Takeshi Seki, Takahide Kubota, Koki Takanashi, Seiji Mitani

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


The electric field effect on magnetic anisotropy was studied in an ultrathin Fe(0 0 1) monocrystalline layer sandwiched between Cr buffer and MgO tunnel barrier layers, mainly through post-annealing temperature and measurement temperature dependences. A large coefficient of the electric field effect of more than 200 fJ (Vm)-1 was observed in the negative range of electric field, as well as an areal energy density of perpendicular magnetic anisotropy (PMA) of around 600 μJ m-2. More interestingly, nonlinear behavior, giving rise to a local minimum around +100 mV nm-1, was observed in the electric field dependence of magnetic anisotropy, being independent of the post-annealing and measurement temperatures. The insensitivity to both the interface conditions and the temperature of the system suggests that the nonlinear behavior is attributed to an intrinsic origin such as an inherent electronic structure in the Fe/MgO interface. The present study can contribute to the progress in theoretical studies, such as ab initio calculations, on the mechanism of the electric field effect on PMA.

Original languageEnglish
Article number40LT04
JournalJournal of Physics D: Applied Physics
Issue number40
Publication statusPublished - 2017 Sep 14


  • electric field effect
  • magnetic tunnel junction
  • magnetoresistance
  • perpendicular magnetic anisotropy
  • ultrathin-Fe
  • voltage controlled magnetic anisotropy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


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