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/ange.201812007

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

Journal Article · Thu Dec 06 00:00:00 EST 2018 · Angewandte Chemie

DOI:https://doi.org/10.1002/ange.201812007· OSTI ID:1484815

^[1]; ^[1]; ^[2]; McCall, Scott K. ^[2]; ^[3]; ^[4]; Yin, Zhouyang ^[1]; ^[5]; ^[1]; ^[1]

Department of Chemistry Brown University Providence RI 02912 USA
Materials Science Division Lawrence Livermore National Laboratory Livermore CA 94550 USA
School of Chemical Engineering and Technology Harbin Institute of Technology Harbin Heilongjiang 150001 China
Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11973 USA
Department of Chemistry Brown University Providence RI 02912 USA, School of Chemical Engineering and Technology Harbin Institute of Technology Harbin Heilongjiang 150001 China

Abstract

We report 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+Sm ₂ O ₃ (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 SmCo ₅ NPs with sizes tunable from 50 to 200 nm. The 200 nm SmCo ₅ NPs were dispersed in ethanol, and magnetically aligned in polyethylene glycol (PEG) matrix, yielding a PEG‐SmCo ₅ 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 SmCo ₅ NPs. The method was extended to synthesize other ferromagnetic NPs of Sm ₂ Co ₁₇ , and, for the first time, of Sm ₂ Fe ₁₇ N ₃ 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.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

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

OSTI ID:: 1484815

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 2 Vol. 131; ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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