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Synthesis of super-fine L1_(0)-FePt nanoparticles with high ordering degree by two-step sintering under high magnetic field

查看全文 作　　者：Dong [1]Zhao;Xiaoyang [2]Wang;Ling [2]Chang;Wenli [1]Pei;Chun [3]Wu;Fei [4]Wang;Luran [5]Zhang;Jianjun [1]Wang;Qiang [2]Wang 高影响力作者 机构地区：[1]Key Laboratory of Anisotropy and Texture of Materials(Ministry of Education),Northeastern University,Shenyang,110819,China;[2]Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education),Northeastern University,Shenyang,110819,China;[3]School of Materials Science and Engineering,Liaoning Technical University,Fuxin,123000,China;[4]College of Mechanical Engineering,Shenyang University,Shenyang,110044,China;[5]School of Materials Science and Engineering,Yunnan University,Kunming,650091,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2021年第14期,共8页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China(Grant nos.51871045,52071070,and 51690161);the Fundamental Research Funds for the Central Universities(Grant no.N2017003);the Doctoral Start-up Foundation of Liaoning Province(Grant no.2019-BS-116)。 摘　　要：Super-fine L1_(0)-Fe Pt nanoparticles(NPs)with high ordering degree were successfully prepared by a modified two-step sintering method,which includes low-temperature pre-sintering,and the high magnetic field(HMF)assisted post-sintering processes.The particle size of the L1_(0)-FePt NPs was obviously refined by lowering the sintering temperature.By applying the HMF during the post-sintering process,the fine size characteristics of L1_(0)-Fe Pt NPs were retained,and the ordering degree was significantly improved.The L1_(0)-Fe Pt NPs with sizes of about 4.5 nm,ordering degree of 0.940,and coercivity of 22.01 k Oe were obtained by this two-step sintering under a magnetic field of 12 T.The mechanism investigation of HMF enhancing the ordering degree indicates that the HMF enhances lattice distortion and magnetization energy(Zeeman energy).The enhanced lattice distortions cause high stress existing in the lattice,which can effectively promote the disordered-order transition.When the magnetic field reaches to 3 T,the Zeeman energy of the NPs is higher than the thermal disturbing energy of the NPs,and the magnetization effect is stronger.Therefore,the HMF(higher than 3 T)can obviously improve the disorder-order transition by lowering the energy barrier and accelerating the orderly diffusions of atoms.The HMF is a promising assistant to synthesize the L1_(0)-phase NPs with both of high ordering degree and super-fine size. 关 键 词：L1_(0)-FePt nanoparticles Super-fine size Disorder-order transition High magnetic field Zeeman energy
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