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High-coercivity magnetism in nanostructures with strong easy-plane anisotropy

机译：具有强易平面各向异性的纳米结构中的高矫顽磁力

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摘要

We report the fabrication of a rare-earth-free permanent-magnet material Co_3Si in the form of nanoparticles and investigate its magnetic properties by experiments and density-functional theory (DFT). The DFT calculations show that bulk Co_3Si has an easy-plane anisotropy with a high K_1 ≈ -64 Merg/cm~3 (-6.4 MJ/m~3) and magnetic polarization of 9.2 kG (0.92 T). In spite of having a negative anisotropy that generally leads to negligibly low coercivities in bulk crystals, Co_3Si nanoparticles exhibit high coercivities (17.4 kOe at 10 K and 4.3 kOe at 300 K). This result is a consequence of the unique nanostructure made possible by an effective easy-axis alignment in the cluster-deposition method and explained using micromagnetic analysis as a nanoscale phenomenon involving quantum-mechanical exchange interactions.
机译：我们报告纳米粒子形式的无稀土永磁材料Co_3Si的制造，并通过实验和密度泛函理论（DFT）研究其磁性。 DFT计算表明，大块Co_3Si具有易平面各向异性，其K_1≈-64 Merg / cm〜3（-6.4 MJ / m〜3）高，磁极化强度为9.2 kG（0.92 T）。尽管具有负各向异性通常会导致块状晶体的矫顽力低至可忽略不计，但Co_3Si纳米颗粒仍显示出高矫顽力（10 K下为17.4 kOe，300 K下为4.3 kOe）。该结果是通过在簇沉积方法中进行有效的易轴对齐而实现的独特纳米结构的结果，并使用微磁分析作为涉及量子机械交换相互作用的纳米级现象进行了解释。

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  • 来源
    《Applied Physics Letters》 |2016年第15期|152406.1-152406.4|共4页
  • 作者

    Balamurugan Balasubramanian; Priyanka Manchanda; Ralph Skomski; Pinaki Mukherjee; Shah R. Valloppilly; Bhaskar Das; George C. Hadjipanayis; David J. Sellmyer;

  • 作者单位

    Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA,Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USA;

    Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA,Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USA;

    Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA,Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USA;

    Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA,Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USA;

    Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA;

    Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA,Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USA;

    Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA;

    Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA,Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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