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In this study, ultrathin CoPt alloy films oriented along face-centered cubic (fcc) (111) with perpendicular magnetic anisotropy (PMA) are fabricated by electrodeposition at room temperature and normal pressure without annealing. By increasing the concentration of Pt ions in the electrolytes, initial nucleation of CoPt becomes fine, forming epitaxial CoPt alloy films oriented along fcc (111) to the film planes with very smooth surfaces (Arithmetic average roughness Ra~0.43 nm). The deposited CoPt films show the lower saturation magnetization (MS~620 emu･cm-3) compared to conventional CoPt films with hexagonal close-packed (hcp) structures. The CoPt film with a thickness of 5 nm exhibits large PMA (anisotropy constant Ku~4.3 Merg･cm-3), coercivity (HC~2.4 kOe), and nucleation field (Hn~2.0 kOe). The fabricated CoPt films contribute to the development of magnetic tunnel junctions with enhanced tunnel magnetoresistance effects and a next-generation magnetic memory with ultrahigh recording density.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: electrodeposition, CoPt

刊行年月日: 2025-04-17

出版者: Elsevier BV

掲載誌:

• Electrochemistry Communications (ISSN: 13882481) vol. 176 107938

研究助成金:

• Core Research for Evolutional Science and Technology G1026
• Ministry of Education, Culture, Sports, Science and Technology JPMXS0440500024
• National Institute for Materials Science
• Core Research for Evolutional Science and Technology JPMJCR21C1

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5566

公開URL: https://doi.org/10.1016/j.elecom.2025.107938

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更新時刻: 2025-07-09 12:30:20 +0900

MDRでの公開時刻: 2025-07-09 12:17:16 +0900