Three-Dimensional Self-Assembly of Core/Shell-Like Nanostructures for High-Performance Nanocomposite Permanent Magnets
Three-Dimensional Self-Assembly of Core/Shell-Like Nanostructures for High-Performance Nanocomposite Permanent Magnets
复制标题
高性能纳米复合永磁体核/壳状纳米结构的三维自组装
DOI：
10.1021/acs.nanolett.6b02210
复制
发表时间：
2016-09-01
期刊：
影响因子：
10.8
通讯作者：
Zhang, Xiangyi
中科院分区：
文献类型：
--
作者：
Li, Hailing;Li, Xiaohong;Zhang, Xiangyi
核/壳纳米结构对于许多先进的应用都很有吸引力，包括强永磁体，磁记录和生物技术：它们通常通过化学方法实现;但这些技术将它们限制在纳米颗粒上。在这里，我们描述了一个三维（3D）自组装的核/壳状纳米复合磁体，与硬磁Nd 2Fe 14 B核心的类似45胸罩和软磁α-Fe壳，类似13 nm，通过物理路径。所得的Nd 2Fe 14 B/α-Fe核/壳状纳米结构允许大的剩磁和高的矫顽力，导致25 MGOe的创纪录的高能量积，其达到各向同性Nd 2Fe 14 B/α-Fe纳米复合磁体的理论极限。我们的方法是基于连续增长的核心和外壳，纳米晶体在合金熔体。这些结果为在3D材料中制备核/壳状纳米结构迈出了重要的一步。
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.