Chemical Synthesis of Magnetically Hard and Strong Rare Earth Metal Based Nanomagnets

Shen, Bo; Yu, Chao; Baker, Alexander A.; McCall, Scott K.; Yu, Yongsheng; Su, Dong; Yin, Zhouyang; Liu, Hu; Li, Junrui; Sun, Shouheng

doi:10.1002/anie.201812007

Title: Chemical Synthesis of Magnetically Hard and Strong Rare Earth Metal Based Nanomagnets

Journal Article · 09 November 2018 · Angewandte Chemie (International Edition)

DOI: https://doi.org/10.1002/anie.201812007 · OSTI ID:1498861

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Brown Univ., Providence, RI (United States). Dept. of Chemistry
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Materials Science Division
Harbin Inst. of Technology (China). School of Chemical Engineering and Technology
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
Brown Univ., Providence, RI (United States). Dept. of Chemistry; Harbin Inst. of Technology (China). School of Chemical Engineering and Technology

We report here a general chemical approach to synthesize strongly ferromagnetic rare-earth metal (REM) based SmCo and SmFeN nanoparticles (NPs) with ultra-large coercivity. The synthesis started with the preparation of hexagonal CoO+Sm₂O₃ (denoted as SmCo-O) multipods via decomposition of Sm(acac)₃ and Co(acac)₃ in oleylamine. These multipods were further reduced with Ca at 850 °C to form SmCo₅ NPs with sizes tunable from 50 to 200 nm. The 200 nm SmCo₅ NPs were dispersed in ethanol, and magnetically aligned in polyethylene glycol (PEG) matrix, yielding a PEG-SmCo₅ NP composite with the room temperature coercivity (H_c) of 49.2 kOe, the largest H_c among all ferromagnetic NPs ever reported, and saturated magnetic moment (M_s) of 88.7 emu g^-1, the highest value reported for SmCo₅ NPs. The method was extended to synthesize other ferromagnetic NPs of Sm₂Co₁₇, and, for the first time, of Sm₂Fe₁₇N₃ NPs with H_c over 15 kOe and M_s reaching 127.9 emu g^-1. These REM based NPs are important magnetic building blocks for fabrication of high-performance permanent magnets, flexible magnets, and printable magnetic inks for energy and sensing applications.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Brown Univ., Providence, RI (United States); Harbin Institute of Technology (China)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office; USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); USDOE

Grant/Contract Number:: SC0012704; AC52-07NA27344; 51571072

OSTI ID:: 1498861

Alternate ID(s):: OSTI ID: 1484816; OSTI ID: 1513158

Report Number(s):: BNL-211351-2019-JAAM; LLNL-JRNL-768237

Journal Information:: Angewandte Chemie (International Edition), Vol. 58, Issue 2; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Chemically synthesized anisotropic SmCo ₅ nanomagnets with a large energy product Ma, Zhenhui; Liang, Jingming; Ma, Wen Nanoscale, Vol. 11, Issue 26 https://doi.org/10.1039/c9nr03412a	journal	January 2019
Dispersible SmCo ₅ nanoparticles with huge coercivity Dong, Ying; Zhang, Tianli; Xia, Zhengcai Nanoscale, Vol. 11, Issue 36 https://doi.org/10.1039/c9nr06653e	journal	January 2019

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