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首页> 外文期刊>Nano letters >Three-Dimensional Self-Assembly of Core/Shell-Like Nanostructures for High-Performance Nanocomposite Permanent Magnets
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Three-Dimensional Self-Assembly of Core/Shell-Like Nanostructures for High-Performance Nanocomposite Permanent Magnets

机译：高性能纳米复合永磁体的核/壳状纳米结构的三维自组装

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摘要

Core/shell nanostructures are fascinating for many advanced applications including strong permanent magnets, magnetic recording, and biotechnology: They are generally achieved via Chemical approaches; but these techniques-limit them to nanoparticles. Here, we describe a three-dimensional (3D) self-assembly of core/shell-like nano composite magnets, with hard-magnetic Nd2Fe14B core of similar to 45 bra and soft-magnetic alpha-Fe Shell, of similar to 13 nm, through a physical route. The resulting Nd2Fe14B/alpha-Fe core/shell-like nanostructure allows both large remanent magnetization and high coercivity, leading to a record-high energy product of 25 MGOe which reaches the theoretical limit for isotropic Nd2Fe14B/alpha-Fe nanocomposite magnets. Our approach is based on a sequential growth-of the core and shell,nanocrystals in an, alloy melt. These results make an important step toward fabricating core/shell-like nanostructure in 3D materials.
机译：核/壳纳米结构在许多先进应用中都非常引人入胜，包括强力永磁体，磁记录和生物技术。但是这些技术将它们限制为纳米颗粒。在这里，我们描述了核/壳状纳米复合磁体的三维（3D）自组装，其硬磁Nd2Fe14B磁芯类似于45胸罩，软磁α-Fe壳体，类似于13 nm，通过物理路线。所得的Nd2Fe14B /α-Fe核/壳状纳米结构既可实现大的剩余磁化强度，又可实现高矫顽力，导致创纪录的25 MGOe高能积，达到了各向同性Nd2Fe14B /α-Fe纳米复合磁体的理论极限。我们的方法基于合金熔体中核和壳纳米晶体的连续生长。这些结果迈出了在3D材料中制造核/壳状纳米结构的重要一步。

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