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<p>In this study, we introduce a simple, cost-effective, and scalable method for producing magnetic nanoparticles. We demonstrate the potentiostatic electrodeposition of Permalloy (NiFe) nanoparticles onto an alumina sacrificial layer over aluminum, achieving high reproducibility and the formation of nanoparticles with a hemispherical morphology, approximately 150 nm in size. A novel approach for detaching the nanoparticles from the substrate and dispersing them into solution is also developed. The interest in these small-scale hemispherical nanoparticles stems from their magnetic vortex configuration, which exhibits low remanence and inhibits the formation of larger clusters in solution due to dipolar interactions. This behavior, attributed to their intrinsic curvature, is particularly relevant for applications in effective magnetohyperthermia therapy for cancer, with possibility of nanoparticles phagocytosis due to it small sizes. The magnetic vortex configuration was characterized for both the nanoparticles on the substrate and in solution using magnetic susceptibility measurements and further confirmed through micromagnetic simulations with the open-source code Mumax<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10008_2025_6230_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">\( ^{3}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>3</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>.</p>

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Low dimensional Permalloy vortex-like hemisphere nanoparticles obtained by electrodeposition

  • 期刊论文

  • 发表日期：

    2025年2月13日

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  • H. A. Teixeira,
  • R. E. C. R. Rodrigues,
  • R. Khan,
  • C. I. L. de Araujo

摘要

In this study, we introduce a simple, cost-effective, and scalable method for producing magnetic nanoparticles. We demonstrate the potentiostatic electrodeposition of Permalloy (NiFe) nanoparticles onto an alumina sacrificial layer over aluminum, achieving high reproducibility and the formation of nanoparticles with a hemispherical morphology, approximately 150 nm in size. A novel approach for detaching the nanoparticles from the substrate and dispersing them into solution is also developed. The interest in these small-scale hemispherical nanoparticles stems from their magnetic vortex configuration, which exhibits low remanence and inhibits the formation of larger clusters in solution due to dipolar interactions. This behavior, attributed to their intrinsic curvature, is particularly relevant for applications in effective magnetohyperthermia therapy for cancer, with possibility of nanoparticles phagocytosis due to it small sizes. The magnetic vortex configuration was characterized for both the nanoparticles on the substrate and in solution using magnetic susceptibility measurements and further confirmed through micromagnetic simulations with the open-source code Mumax \( ^{3}\) 3 .