采用电沉积法制备fcc（111）取向和垂直磁各向异性超薄CoPt合金薄膜

IF 4.7 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications Pub Date : 2025-04-17 DOI:10.1016/j.elecom.2025.107938

Daiki Araki , Yoshiaki Sonobe , Yukiko K. Takahashi , Takayuki Homma

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引用次数: 0

摘要

在室温常压下电沉积制备了具有垂直磁各向异性（PMA）的面心立方（fcc）（111）超薄CoPt合金薄膜。通过增加电解质中Pt离子的浓度，CoPt的初始形核变得精细，形成沿fcc（111）取向的外延CoPt合金薄膜，薄膜表面非常光滑（算术平均粗糙度Ra ~ 0.43 nm）。与具有六方密排（hcp）结构的常规CoPt膜相比，沉积的CoPt膜具有较低的饱和磁化强度（MS ~ 620 emu ~ cm−3）。厚度为5 nm的CoPt薄膜具有较大的PMA（各向异性常数Ku ~ 4.3 Merg日圆cm−3）、矫顽力（HC ~ 2.4 kOe）和成核场（Hn ~ 2.0 kOe）。所制备的CoPt薄膜有助于具有增强隧道磁阻效应的磁隧道结和具有超高记录密度的下一代磁存储器的发展。

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Ultrathin CoPt alloy films with fcc (111) orientation and perpendicular magnetic anisotropy fabricated by electrodeposition

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 (M_S ∼ 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 K_u ∼ 4.3 Merg･cm⁻³), coercivity (H_C ∼ 2.4 kOe), and nucleation field (H_n ∼ 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.

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来源期刊

Electrochemistry Communications 工程技术-电化学

CiteScore

8.50

自引率

3.70%

发文量

160

审稿时长

1.2 months

期刊介绍： Electrochemistry Communications is an open access journal providing fast dissemination of short communications, full communications and mini reviews covering the whole field of electrochemistry which merit urgent publication. Short communications are limited to a maximum of 20,000 characters (including spaces) while full communications and mini reviews are limited to 25,000 characters (including spaces). Supplementary information is permitted for full communications and mini reviews but not for short communications. We aim to be the fastest journal in electrochemistry for these types of papers.