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

研究成果: Article査読

4 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号202402
ジャーナルApplied Physics Letters
112
20
DOI
出版ステータスPublished - 2018 5 14

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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