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Magnetic response of cobalt nanowires with diameter below 5 nm

机译:直径小于5 nm的钴纳米线的磁响应

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摘要

The structural and magnetic properties of cobalt nanowires embedded in epitaxial CeO_2 layers are investigated. Combining electron microscopy with x-ray absorption spectroscopy, we show that polycrystalline metallic Co nanowires are formed during the growth. These nanowires are oriented in average along the growth axis with a misalignment distribution, have a predominant hep structure and a narrow distribution of diameters. Their magnetic properties are overall dominated by shape effects with an easy axis oriented along the mean direction of the wires axis. The reversal mechanism is studied in details for samples with 3 and 5 nm mean diameters. The competition between shape and magnetocrystalline anisotropies is evidenced at 3 nm diameter. Upon reduction in the lateral dimensions, the nanowires tend to behave like aligned Stoner-Wohlfarth elongated particles with effective uniaxial anisotropy resulting from this competition.
机译:研究了外延CeO_2层中嵌入的钴纳米线的结构和磁性。结合电子显微镜和X射线吸收光谱,我们表明在生长过程中形成了多晶金属Co纳米线。这些纳米线平均沿生长轴取向,具有未对准分布,具有主要的大麻结构和狭窄的直径分布。它们的磁性能总体上受形状效应支配,其易轴沿导线轴​​的平均方向定向。对平均直径为3和5 nm的样品的反转机理进行了详细研究。形状和磁晶各向异性之间的竞争在直径3 nm处得到证明。在横向尺寸减小时,纳米线趋于表现得像对准的Stoner-Wohlfarth细长颗粒,具有由于这种竞争而产生的有效单轴各向异性。

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  • 来源
    《Physical review》 |2010年第9期|p.094436.1-094436.9|共9页
  • 作者单位

    Institut des NanoSciences de Paris, UPMC Paris 06, CNRS UMR 7588, 140 rue de Lourmel, 75015 Paris, France Departamento de Fisica, UFSCar, CP 676, 13565-905 Sao Carlos, SP, Brazil;

    rnInstitut des NanoSciences de Paris, UPMC Paris 06, CNRS UMR 7588, 140 rue de Lourmel, 75015 Paris, France Laboratoire Franco-Argentin en Nanosciences (LIFAN), France;

    rnInstitut des NanoSciences de Paris, UPMC Paris 06, CNRS UMR 7588, 140 rue de Lourmel, 75015 Paris, France Laboratoire Franco-Argentin en Nanosciences (LIFAN), France;

    rnInstitut des NanoSciences de Paris, UPMC Paris 06, CNRS UMR 7588, 140 rue de Lourmel, 75015 Paris, France Laboratoire Franco-Argentin en Nanosciences (LIFAN), France CNEA-CONICET and Instituto Balseiro, CAB, UNCU, R8402AGP San Carlos de Bariloche, RN, Argentina;

    rn5Synchrotron Soleil, L'Orme des Merisiers Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France;

    rnInstitut des NanoSciences de Paris, UPMC Paris 06, CNRS UMR 7588, 140 rue de Lourmel, 75015 Paris, France;

    6Laboratoire d'Optique Appliquee, ENSTA Paristech, Ecole Polytechnique, CNRS UMR 7639, F-91761 Palaiseau Cedex, France;

    rnDepartamento de Fisica, UFPR, CP 19044, 81531-990 Curitiba, PR, Brazil;

    2Departamento de Fisica, UFSCar, CP 676, 13565-905 Sao Carlos, SP, Brazil;

    rnInstitut des NanoSciences de Paris, UPMC Paris 06, CNRS UMR 7588, 140 rue de Lourmel, 75015 Paris, France Laboratoire Franco-Argentin en Nanosciences (LIFAN), France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetization reversal mechanisms; laser deposition;

    机译:磁化反转机制;激光沉积;

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