層厚を制御した人工強磁性細線の作製に成功～人工強磁性細線を利用した大容量メモリや磁気センサ開発へ道筋～

2025-03-25 京都大学

＜関連情報＞

• https://www.kyoto-u.ac.jp/ja/research-news/2025-03-25
• https://www.kyoto-u.ac.jp/sites/default/files/2025-03/web_2503_Ono-2aa1869af6dffce0e28c217adab6a513.pdf
• https://iopscience.iop.org/article/10.35848/1882-0786/adbcf6

ナノポーラスポリカーボネート膜中でデュアルバス電着法により作製したCo-Pt合金多層ナノワイヤーにおける層厚の人為的制御 Artificial control of layer thickness in Co-Pt alloy multilayer nanowires fabricated by dual-bath electrodeposition in nanoporous polycarbonate membranes

Rio Kawana, Natsuko Oguchi, Daiki Oshima, Michiyuki Yoshida, Takashi Sugiura, Mikiko Saito, Takayuki Homma, Takeshi Kato, Teruo Ono, Mutsuhiro Shima,…
Applied Physics Express  Published: 20 March 2025
DOI:10.35848/1882-0786/adbcf6

Abstract

We have successfully controlled the layer thickness in Co-Pt alloy multilayer nanowires with a diameter of approximately 130 nm through dual-bath electrodeposition into nanoporous polycarbonate templates. The Co-Pt alloy multilayer nanowires were found to have compositions of cobalt-rich (Co₇₁Pt₂₉) and platinum-rich (Co₁₃Pt₈₇) for various layer thicknesses ranging from 3.3 to 427 nm, as confirmed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations. Both X-ray diffraction (XRD) and TEM analyses revealed a face-centered cubic (FCC) alloy phase corresponding to the Co-Pt alloy in each layer. We could measure the increasing magnetoresistance (MR) ratio by reducing the layer thickness and demonstrate MR measurements resulting from domain wall motion.