Thickness Dependence of Anisotropic Magnetoresistance in CoPt Alloy Multilayer Nanowires Fabricated by Dual-Bath Electrodeposition

IF 1.9 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Magnetics Pub Date : 2026-10-01 Epub Date: 2026-03-28 DOI:10.1109/TMAG.2026.3697825

Rio Kawana;Daiki Oshima;Mikiko Saito;Takayuki Homma;Takeshi Kato;Teruo Ono;Mutsuhiro Shima;Keisuke Yamada

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Abstract

We investigated the dependence of anisotropic magnetoresistance (AMR) on the layer thickness and Co composition of Co-rich/Pt-rich CoPt alloy multilayer nanowires fabricated by dual-bath electrodeposition using nanoporous templates. Single-nanowire current-perpendicular-to-plane (CPP) electrical transport measurements revealed that reducing the individual layer thickness to a few nanometers significantly enhanced the AMR ratio, yielding a value that was 2.7

$\times$

higher than that of single-layer CoPt alloy nanowires. This enhancement might be attributed to increased interfacial spin-dependent scattering in the multilayer structure under CPP transport. In addition, the Co composition of the Co-rich layers had little effect on the AMR ratio in the high-field saturation region. In contrast, clear differences in AMR behavior were observed at low magnetic fields, indicating that the Co composition influenced the magnetization rotation process rather than the intrinsic anisotropic resistance. These findings elucidated the mechanisms underlying AMR enhancement in multilayer nanowires and provided insight into interface-dominated spin-dependent transport for the development of high-density magnetic sensors and magnetic memory devices.

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双浴电沉积法制备CoPt合金多层纳米线各向异性磁电阻的厚度依赖性

研究了双槽电沉积法制备的富Co /富pt CoPt合金多层纳米线的各向异性磁电阻（AMR）与层厚和Co成分的关系。单纳米线电流垂直平面（CPP）电输运测量表明，将单个层厚度减小到几纳米可显著提高AMR比，产生的值比单层CoPt合金纳米线高2.7倍。这种增强可能归因于CPP输运下多层结构中界面自旋相关散射的增加。此外，富钴层Co组成对高场饱和区的AMR比影响不大。相比之下，在低磁场下，AMR行为有明显差异，表明Co成分影响磁化旋转过程，而不是本征各向异性电阻。这些发现阐明了多层纳米线中AMR增强的机制，并为高密度磁传感器和磁存储器件的开发提供了界面主导的自旋依赖输运的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Magnetics 工程技术-工程：电子与电气

CiteScore

4.00

自引率

14.30%

发文量

565

审稿时长

4.1 months

期刊介绍： Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.