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  • 标题:Large voltage-induced coercivity change in Pt/Co/CoO/amorphous TiO x structure and heavy metal insertion effect
  • 本地全文:下载
  • 作者:Tomohiro Nozaki ; Shingo Tamaru ; Makoto Konoto
  • 期刊名称:Scientific Reports
  • 电子版ISSN:2045-2322
  • 出版年度:2021
  • 卷号:11
  • DOI:10.1038/s41598-021-00960-w
  • 语种:English
  • 出版社:Springer Nature
  • 摘要:There is urgent need for spintronics materials exhibiting a large voltage modulation effect to fulfill the great demand for high-speed, low-power-consumption information processing systems. Fcc-Co (111)-based systems are a promising option for research on the voltage effect, on account of their large perpendicular magnetic anisotropy (PMA) and high degree of freedom in structure. Aiming to observe a large voltage effect in a fcc-Co (111)-based system at room temperature, we investigated the voltage-induced coercivity ( H c) change of perpendicularly magnetized Pt/heavy metal/Co/CoO/amorphous TiO x structures. The thin CoO layer in the structure was the result of the surface oxidation of Co. We observed a large voltage-induced H c change of 20.2 mT by applying 2 V (0.32 V/nm) to a sample without heavy metal insertion, and an H c change of 15.4 mT by applying 1.8 V (0.29 V/nm) to an Ir-inserted sample. The relative thick Co thickness, Co surface oxidation, and large dielectric constant of TiO x layer could be related to the large voltage-induced H c change. Furthermore, we demonstrated the separate adjustment of H c and a voltage-induced H c change by utilizing both upper and lower interfaces of Co.
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