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首页> 外文期刊>Advanced Functional Materials >High-Density Periodically Ordered Magnetic Cobalt Ferrite Nanodot Arrays by Template-Assisted Pulsed Laser Deposition
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High-Density Periodically Ordered Magnetic Cobalt Ferrite Nanodot Arrays by Template-Assisted Pulsed Laser Deposition

机译：模板辅助脉冲激光沉积的高密度周期性有序磁性钴铁氧体纳米点阵列

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摘要

A novel nanopatterning method using pulsed laser deposition through an ultrathin anodic aluminium oxide (AAO) membrane mask is proposed to synthesize well-ordered nanodot arrays of magnetic CoFe_2O_4 that feature a wide range of applications like sensors, drug delivery, and data storage. This technique allows the adjustment of the array dimension from ～35 to ～300nm in diameter and ～65 to ～500nm in inter-dot distance. The dot density can be as high as 0.21 Terabit in.~(-2). The microstructure of the nanodots is characterized by SEM, TEM, and XRD and their magnetic properties are confirmed by well-defined magnetic force microscopy contrasts and by hysteresis loops recorded by a superconducting quantum interference device. Moreover, the high stability of the AAO mask enables the epitaxial growth of nanodots at a temperature as high as 550 ℃. The epitaxial dots demonstrate unique complex magnetic domains such as bubble and stripe domains, which are switchable by external magnetic fields. This patterning method creates opportunities for studying novel physics in oxide nanomagnets and may find applications in spintronic devices.
机译：提出了一种通过脉冲激光沉积通过超薄阳极氧化铝（AAO）膜掩模的新型纳米图案化方法，以合成磁性CoFe_2O_4的排列良好的纳米点阵列，该阵列具有广泛的应用，例如传感器，药物输送和数据存储。该技术允许将阵列尺寸的直径从〜35nm调整到〜300nm，点间距离从〜65nm调整到〜500nm。点密度可以高达0.21 TB（〜）。纳米点的微观结构由SEM，TEM和XRD表征，其磁性能由明确定义的磁力显微镜对比和超导量子干涉装置记录的磁滞回线来确认。此外，AAO掩模的高稳定性使纳米点可在高达550℃的温度下外延生长。外延点显示出独特的复杂磁畴，例如气泡和条纹磁畴，这些磁畴可通过外部磁场切换。这种图案化方法为研究氧化物纳米磁体中的新型物理学创造了机会，并可能在自旋电子器件中找到应用。

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  • 来源
    《Advanced Functional Materials》 |2009年第21期|3450-3455|共6页
  • 作者

    Xingsen Gao; Lifeng Liu; Balaji Birajdar; Michael Ziese; Woo Lee; Marin Alexe; Dietrich Hesse;

  • 作者单位

    Max Planck Institute of Microstructure Physics Weinberg 2, D-06120 Halle (Saale) (Germany);

    Max Planck Institute of Microstructure Physics Weinberg 2, D-06120 Halle (Saale) (Germany);

    Max Planck Institute of Microstructure Physics Weinberg 2, D-06120 Halle (Saale) (Germany);

    Div. of Superconductivity and Magnetism University of Leipzig D-04103 Leipzig (Germany);

    Korea Research Institute of Standards and Science (KRISS) Yuseong, 305-340 Daejon(Korea);

    Max Planck Institute of Microstructure Physics Weinberg 2, D-06120 Halle (Saale) (Germany);

    Max Planck Institute of Microstructure Physics Weinberg 2, D-06120 Halle (Saale) (Germany);

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