title: Three-Dimensional Self-Assembly of Core/Shell-Like Nanostructures for High-Performance Nanocomposite Permanent Magnets.
abstract: 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 nanocomposite magnets, with hard-magnetic Nd2Fe14B core of ∼45 nm and soft-magnetic α-Fe shell of ∼13 nm, through a physical route. The resulting Nd2Fe14B/α-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/α-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.
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, China.
authors: Hailing
authors: H
authors: Li
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, China.|College of Science, Yanshan University , Qinhuangdao 066004, China.
authors: Xiaohong
authors: X
authors: Li
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, China.|College of Science, Yanshan University , Qinhuangdao 066004, China.
authors: Defeng
authors: D
authors: Guo
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, China.
authors: Li
authors: L
authors: Lou
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, China.
authors: Wei
authors: W
authors: Li
authors: State Key Laboratory of Metastable Materials Science and Technology, Yanshan University , Qinhuangdao 066004, China.
authors: Xiangyi
authors: X
authors: Zhang
keywords: core/shell nanostructure; nanocomposite magnets; nanostructuring; self-assembly