arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1101.5899cond-mat.mtrl-sci
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磁性纳米粒子的模板辅助自组装

Template assisted self-assembly of individual and clusters of magnetic nanoparticles

Giovanni A. Badini Confalonieri, Victor Vega, Astrid Ebbing, Durgamadhab Mishra, Philipp Szary, Victor M. Prida, Oleg Petracic, Hartmut Zabel

摘要:

对纳米结构的空间排列的有意控制是许多应用的期望目标,例如在数据存储、等离子体或传感器阵列中。在这里,我们提出了一种新的方法来帮助磁性纳米粒子的自组装过程。该方法利用在铝盘的阳极化之后获得的纳米结构化铝模板以及随后的新形成的氧化铝层的生长和去除,导致六边形谷的规则蜂窝型阵列。将直径为20 nm的氧化铁纳米颗粒旋涂到纳米结构化模板上。根据大小,每个六边形位点可以容纳多达30个纳米颗粒。这些纳米颗粒在谷内形成不同排列的簇,例如轴环、链和六边形闭合岛。最终,可以分离单个纳米颗粒。利用超自旋玻璃系统中耦合态的记忆效应,研究了团簇中粒子间的磁相互作用强度。

英文摘要:

The deliberate control over the spatial arrangement of nanostructures is the desired goal for many applications as e.g. in data storage, plasmonics or sensor arrays. Here we present a novel method to assist the self-assembly process of magnetic nanoparticles. The method makes use of nanostructured aluminum templates obtained after anodization of aluminum disks and the subsequent growth and removal of the newly formed alumina layer, resulting in a regular honeycomb type array of hexagonally shaped valleys. The iron oxide nanoparticles, 20 nm in diameter, are spin coated onto the nanostructured templates. Depending on the size, each hexagon site can host up to 30 nanoparticles. These nanoparticles form clusters of different arrangements within the valleys, such as collars, chains, and hexagonally closed islands. Ultimately, it is possible to isolate individual nanoparticles. The strengths of magnetic interaction between particles in a cluster is probed using the memory effect known from the coupled state in superspin glass systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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