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首页> 外文期刊>Advanced Functional Materials >Enhanced Collective Magnetic Properties Induced by the Controlled Assembly of Iron Oxide Nanoparticles in Chains
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Enhanced Collective Magnetic Properties Induced by the Controlled Assembly of Iron Oxide Nanoparticles in Chains

机译：链状氧化铁纳米粒子的受控组装诱导的增强的集体磁性能

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摘要

1D assemblies of magnetic nanoparticles are of great potential for designing novel nanostructured materials with enhanced collective magnetic properties. In that challenging context, a new assembly strategy is presented to prepare chains of magnetic nanoparticles that are well-defined in structure and in spatial arrangement. The 1D assembly of iron oxide nanoparticles onto a substrate is controlled using "click" chemistry under an external magnetic field. Co-aligned single nanoparticle chains separated by regular distances can be obtained by this strategy. The intrinsic high uniaxial anisotropy results in a strong enhancement of magnetic collective properties in comparison to 2D monolayers or isolated nanoparticles. In contrast to the intensively studied bundle chains of nanoparticles, the finely tuned chain structure reported here allows evidencing a first order intrachain dipolar interaction and a second order interchain magnetic coupling. This study offers new insights into the collective magnetic properties of highly anisotropic particulate assemblies which have been investigated by combining superconducting quantum interference device magnetometry, magnetic force microscopy, and ferromagnetic resonance.
机译：磁性纳米粒子的一维组装对于设计具有增强的集体磁性的新型纳米结构材料具有巨大的潜力。在这种具有挑战性的背景下，提出了一种新的组装策略来制备磁性纳米颗粒链，这些磁性纳米颗粒在结构和空间排列上都明确定义。氧化铁纳米粒子在基材上的一维组装是在外部磁场下使用“点击”化学方法控制的。通过这种策略可以获得以规则距离分开的共排列的单个纳米颗粒链。与2D单层或分离的纳米粒子相比，固有的高单轴各向异性导致磁性集体性质的强烈增强。与深入研究的纳米粒子束链相反，此处报道的微调链结构可以证明一级链内偶极相互作用和二级链间磁耦合。这项研究提供了对高度各向异性颗粒组件的集体磁性能的新见解，已通过结合超导量子干涉仪磁强计，磁力显微镜和铁磁谐振进行了研究。

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