Non-linear variation of domain period under electric field in demagnetized CoFeB/MgO stacks with perpendicular easy axis

N. Ichikawa, T. Dohi, A. Okada, H. Sato, S. Fukami, H. Ohno

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We investigate a variation of magnetic domain pattern in demagnetized perpendicular-easy-axis CoFeB/MgO stacks with a wide-range electric field and discuss the electric-field effect on the exchange stiffness constant AS. We observe a non-linear variation of domain period DP with the applied electric field, in contrast to the effective perpendicular anisotropy field HKeff that is evaluated from a ferromagnetic resonance and shows a linear response. An analysis based on a model describing the relation of DP to AS and HKeff suggests that AS varies non-linearly with the electric field, implying an involved characteristic mechanism of the exchange stiffness in the studied systems. A possible scenario for explaining the non-linear behavior of AS is discussed.

Original languageEnglish
Article number202402
JournalApplied Physics Letters
Volume112
Issue number20
DOIs
Publication statusPublished - 2018 May 14

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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