A novel strategy for the fabrication of highperformance nanostructured Ce-Fe-B magnetic materials via electron-beam exposure  

一种通过电子束曝光制备高性能纳米结构Ce-Fe-B磁性材料的新方法

作　　者：Liang Zha Cholsong Kim Chao Yun Dong Zhou Wei Li Xiangdong Kong Li Han Wenyun Yang Shunquan Liu Jingzhi Han Changsheng Wang Honglin Du Weixing Xia Alberto Bollero Jinbo Yang 查亮;金哲星;贠超;周栋;李卫;孔祥东;韩立;杨文云;刘顺荃;韩景智;王常生;杜红林;夏卫星;Alberto Bollero;杨金波(State Key Laboratory for Mesoscopic Physics,School of Physics,Peking University,Beijing 100871,China;Functional Materials Research Institute,Central Iron&Steel Research Institute,Beijing 100081,China;Department of Micro-Nano Fabrication Technology,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Division of Permanent Magnets and Applications,IMDEA Nanoscience,Madrid,Spain;Collaborative Innovation Center of Quantum Matter,Beijing 100871,China;Beijing Key Laboratory for Magnetoelectric Materials and Devices,Beijing 100871,China)

机构地区：[1]State Key Laboratory for Mesoscopic Physics,School of Physics,Peking University,Beijing 100871,China [2]Functional Materials Research Institute,Central Iron&Steel Research Institute,Beijing 100081,China [3]Department of Micro-Nano Fabrication Technology,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China [4]Key Laboratory of Magnetic Materials and Devices,Ningbo Institute of Material Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China [5]Division of Permanent Magnets and Applications,IMDEA Nanoscience,Madrid,Spain [6]Collaborative Innovation Center of Quantum Matter,Beijing 100871,China [7]Beijing Key Laboratory for Magnetoelectric Materials and Devices,Beijing 100871,China

出　　处：《Science China Materials》2021年第10期2519-2529,共11页中国科学（材料科学（英文版）

基　　金：supported by the National Key Research and Development Program of China (2016YFB0700901);the National Natural Science Foundation of China (51731001, 11675006 and 51371009);financial support from the China Scholarship Council (CSC) by a State Scholarship Fund (201906010220)support from the “Severo Ochoa” Programme for Centres of Excellence in R&D (MINECO, SEV-2016-0686)

摘　　要：Ce_(2)Fe_(14)B compound has a great potential to serve as a novel permanent magnet alternative thanks to the abundant and inexpensive rare-earth element(cerium),while its low magnetocrystalline anisotropy and energy product severely restrict its applications.In this work,a novel strategy combining melt-spinning and electron-beam exposure(EBE)aiming for fabricating high-performance Ce-Fe-B magnetic materials is reported to solve the above-mentioned problem.Remarkably,this strategy facilitates developing a suitable grain boundary configuration without using any additional heavy rare-earth element.Under the optimal EBE condition,the maximum energy product((BH)max)of pure Ce-Fe-B alloy is 6.5 MGOe,about four times higher than that obtained after conventional rapid thermal processing method for the same precursor.The enhanced intergranular magnetostatic coupling effect in the EBE sample is validated by mapping the first-order-reversal-curve(FORC)diagrams.The in-situ observation of magnetic domain wall motion for Ce-Fe-B alloy using Lorentz transmission electron microscopy reveals that the boundary layers are very effective in pinning the motion of domain walls,leading to the increased coercivity under EBE,and this pinning effect is further verified by micromagnetic simulations.Our results suggest that Ce Fe B materials using EBE could be a promising candidate after further processing,which could fill the performance“gap”between hexaferrite and Nd-Fe-B-based magnets.Ce_(2)Fe_(14)B作为一种基于广泛而廉价的稀土(铈)的新型永磁体,低矫顽力和低最大磁能积严重限制了其在永磁领域中的应用.在这项工作中,我们报道了一种将熔融纺丝技术和电子束曝光(EBE)技术结合的新方法,旨在制造高性能Ce-Fe-B磁体.值得注意的是,该方法可以在不使用任何其他重稀土元素的情况下调控出合适的晶界构型.在最佳EBE条件下,纯Ce-Fe-B合金的最大磁能积为6.5 MGOe,比常规快速热处理方法制备的合金的最大磁能积高四倍左右.这说明,使用EBE制备的Ce Fe B材料作为前驱体,经过进一步加工之后,如热变形或烧结,有望填补六角铁氧体与Nd-Fe-B磁体之间的市场空白.

关 键 词：nanoscale magnets rapid thermal annealing Ce-Fe-B magnetic properties nanocrystalline material 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TG132.27[金属学及工艺—合金]