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Giant magnetic coercivity in Fe3C-filled carbon nanotubes

机译:Fe3C填充的碳纳米管中的巨磁力矫顽力

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One of the major challenges in the synthesis of ferromagnetically filled carbon nanotubes is the achievement of high coercivities. Up to now the highest coercivity has been shown to be 2200 Oe at 2 K ranging down to 500 Oe at temperatures of 300 K. Here we show that the anomalously large coercivity of 3440 Oe is observed in comparable samples. By comparing our result to those reported in previous studies no correlation is found between coercivity and the shape anisotropy or the crystal-diameter. Instead we suggest that the main parameter which controls the coercivity of these structures is the interplay of the grain size and shape anisotropy. We attribute the anomalous coercivity to the grain size being below the calculated single magnetic domain limit.
机译:合成铁磁性填充的碳纳米管的主要挑战之一是获得高矫顽力。迄今为止,最高矫顽力已显示为在2 K下为2200 Oe,在300 K温度下降至500 Oe。在这里,我们显示在可比较的样品中观察到3440 Oe的异常大矫顽力。通过将我们的结果与以前的研究结果进行比较,在矫顽力与形状各向异性或晶体直径之间没有发现相关性。相反,我们建议控制这些结构矫顽力的主要参数是晶粒尺寸和形状各向异性的相互作用。我们将异常矫顽力归因于晶粒尺寸低于计算出的单个磁畴极限。

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