Voltage-controlled magnetic anisotropy in Fe|MgO tunnel junctions studied by x-ray absorption spectroscopy
| Autor: | Kazuhito Tanaka, Yoshinori Kotani, Tetsuya Nakamura, Minori Goto, Shinji Miwa, Kensho Matsuda, Yoshishige Suzuki |
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| Rok vydání: | 2015 |
| Předmět: |
X-ray absorption spectroscopy
Magnetic anisotropy Tunnel effect Physics and Astronomy (miscellaneous) Absorption spectroscopy Condensed matter physics Magnetic circular dichroism Chemistry Condensed Matter::Superconductivity Electric field Electric potential Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Anisotropy |
| Zdroj: | Applied Physics Letters. 107:162402 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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