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<p>CoPt/Pt multilayer nanowire arrays have been fabricated using ac pulsed electrodeposition into ~ 100&#xa0;nm diameter nanopores of anodic aluminum oxide templates using single bath electrolytic technique. Here, we have investigated the effect on four samples by varying the <i>pH</i> values 2.5, 3.5, 4.5 and 5.5. Scanning electron microscopy demonstrated that the fabricated nanowires are homogeneous, continuous, and densely packed. Transmission electron micrographs confirmed the formation of a multilayer structure with uniform layer thickness. Energy-dispersive X-ray spectroscopy measurements confirmed the change in the composition of Co from 89.54 to 80.19 wt.% and Pt composition from 10.46 to 19.81 wt.% as <i>pH</i> changes from 2.5 to 5.5, respectively. X-ray diffraction results showed that the crystal structure of produced nanowires was <i>fcc</i> at <i>pH</i> 2.5 and it changes to the combination of <i>fcc</i> and <i>hcp</i> as the <i>pH</i> increases from 3.5 to 5.5. A high value of coercivity has been achieved 2196 Oe parallel to the nanowire axis, and 827 Oe perpendicular to the nanowire axis. A significant increase in coercivity is observed at low <i>pH</i> in CoPt/Pt multilayer nanowires. The coercivity at a <i>pH</i> of 2.5 is recorded at 2196 Oe, whereas at a <i>pH</i> of 4.5, it measures 2046 Oe in the parallel direction. This difference indicates that acidic environments enhance magnetic anisotropy.</p>

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Structure and tuning magnetic properties of CoPt/Pt multilayer nanowires induced by electrolyte acidity

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Shreesh Kumar Shrivastava,
  • Shivani Agarwal,
  • Manvendra Singh Khatri,
  • Prakash Kanjariya,
  • Asha Rajiv,
  • Aman Shankhyan,
  • Helen Merina Albert,
  • Harish Kumar

摘要

CoPt/Pt multilayer nanowire arrays have been fabricated using ac pulsed electrodeposition into ~ 100 nm diameter nanopores of anodic aluminum oxide templates using single bath electrolytic technique. Here, we have investigated the effect on four samples by varying the pH values 2.5, 3.5, 4.5 and 5.5. Scanning electron microscopy demonstrated that the fabricated nanowires are homogeneous, continuous, and densely packed. Transmission electron micrographs confirmed the formation of a multilayer structure with uniform layer thickness. Energy-dispersive X-ray spectroscopy measurements confirmed the change in the composition of Co from 89.54 to 80.19 wt.% and Pt composition from 10.46 to 19.81 wt.% as pH changes from 2.5 to 5.5, respectively. X-ray diffraction results showed that the crystal structure of produced nanowires was fcc at pH 2.5 and it changes to the combination of fcc and hcp as the pH increases from 3.5 to 5.5. A high value of coercivity has been achieved 2196 Oe parallel to the nanowire axis, and 827 Oe perpendicular to the nanowire axis. A significant increase in coercivity is observed at low pH in CoPt/Pt multilayer nanowires. The coercivity at a pH of 2.5 is recorded at 2196 Oe, whereas at a pH of 4.5, it measures 2046 Oe in the parallel direction. This difference indicates that acidic environments enhance magnetic anisotropy.