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<p>We present a theoretical investigation of magnetotransport in Co/Cu magnetic superlattices characterized by fully specular outer surfaces and atomically smooth interfaces. The study focuses on the influence of the Co mean free path (λ<sub>Co</sub>), varied from 75&#xa0;Å to 500&#xa0;Å, for three fixed Cu mean free paths (λ<sub>Cu</sub>): 400&#xa0;Å, 1300&#xa0;Å, and 2200&#xa0;Å. The results show that the magnetoresistance (MR) decreases significantly with increasing λ<sub>Co</sub>, due to the reduced efficiency of spin-dependent electron scattering in the Co layers. Specifically, MR drops from 0.139 to 0.0027 for <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\uplambda}_{\textrm{Cu}}=400\)</EquationSource> </InlineEquation>&#xa0;Å, from 0.6719 to 0.0410 for 1300&#xa0;Å, and from 1.2007 to 0.1201 for 2200&#xa0;Å. In parallel, all resistivity components—including spin-dependent (ρ<sup>↑↓</sup>, ρ<sup>↑↑</sup>) and layer-specific (Co, Cu, and total superlattice)—decrease markedly with increasing λ<sub>Co</sub>, highlighting the impact of intrinsic scattering processes on electronic transport. These results provide quantitative benchmarks for optimizing the transport properties of spintronic multilayers under ideal structural conditions and contribute to a deeper understanding of how mean free paths and structural quality jointly govern spin-dependent conduction in magnetic nanostructures.</p>

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Magnetoresistance in Co/Cu Superlattices: impact of mean free paths and spin-dependent scattering

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Bassem Elsafi

摘要

We present a theoretical investigation of magnetotransport in Co/Cu magnetic superlattices characterized by fully specular outer surfaces and atomically smooth interfaces. The study focuses on the influence of the Co mean free path (λCo), varied from 75 Å to 500 Å, for three fixed Cu mean free paths (λCu): 400 Å, 1300 Å, and 2200 Å. The results show that the magnetoresistance (MR) decreases significantly with increasing λCo, due to the reduced efficiency of spin-dependent electron scattering in the Co layers. Specifically, MR drops from 0.139 to 0.0027 for \({\uplambda}_{\textrm{Cu}}=400\)  Å, from 0.6719 to 0.0410 for 1300 Å, and from 1.2007 to 0.1201 for 2200 Å. In parallel, all resistivity components—including spin-dependent (ρ↑↓, ρ↑↑) and layer-specific (Co, Cu, and total superlattice)—decrease markedly with increasing λCo, highlighting the impact of intrinsic scattering processes on electronic transport. These results provide quantitative benchmarks for optimizing the transport properties of spintronic multilayers under ideal structural conditions and contribute to a deeper understanding of how mean free paths and structural quality jointly govern spin-dependent conduction in magnetic nanostructures.