Voltage-controlled magnetic anisotropy in Fe|MgO tunnel junctions studied by x-ray absorption spectroscopy

Shinji Miwa, Kensho Matsuda, Kazuhito Tanaka, Yoshinori Kotani, Minori Goto, Tetsuya Nakamura, Yoshishige Suzuki

研究成果: Article査読

38 被引用数 (Scopus)

抄録

In this study, voltage-controlled magnetic anisotropy (VCMA) in Fe|MgO tunnel junctions was investigated via the magneto-optical Kerr effect, soft x-ray absorption spectroscopy, and magnetic circular dichroism spectroscopy. The Fe|MgO tunnel junctions showed enhanced perpendicular magnetic anisotropy under external negative voltage, which induced charge depletion at the Fe|MgO interface. Despite the application of voltages of opposite polarity, no trace of chemical reaction such as a redox reaction attributed to O2- migration was detected in the x-ray absorption spectra of the Fe. The VCMA reported in the Fe|MgO-based magnetic tunnel junctions must therefore originate from phenomena associated with the purely electric effect, that is, surface electron doping and/or redistribution induced by an external electric field.

本文言語English
論文番号162402
ジャーナルApplied Physics Letters
107
16
DOI
出版ステータスPublished - 2015 10 19
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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