PREPARATION, STRUCTURE AND MAGNETIC PROPERTIES OF SmCo5 NANOPARTICLES AND NANOFLAKES

doi:10.3724/SP.J.1037.2011.00643

Acta Metall Sin

2012, Vol. 48

Issue (4): 475-479 DOI: 10.3724/SP.J.1037.2011.00643

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PREPARATION, STRUCTURE AND MAGNETIC PROPERTIES OF SmCo₅ NANOPARTICLES AND NANOFLAKES

LIU Rongming^1,2, YUE Ming¹, ZHANG Dongtao¹,Liu Weiqiang¹, ZHANG Jiuxing¹

1. Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100124
2. State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190

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LIU Rongming, YUE Ming, ZHANG Dongtao,Liu Weiqiang, ZHANG Jiuxing. PREPARATION, STRUCTURE AND MAGNETIC PROPERTIES OF SmCo₅ NANOPARTICLES AND NANOFLAKES. Acta Metall Sin, 2012, 48(4): 475-479.

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Abstract Surfactant-assisted high energy ball milling technique is a new method of producing magnetic nanoparticles. In this study, permanent magnetic SmCo₅ nanoparticles and nanoflakes with high room-temperature coercivity values and narrow particle size distributions were produced by this technology and a subsequent size-selection process. The SmCo₅ nanoparticles with average particle sizes of 9.8 and 47.5 nm, exhibited room-temperature coercivity values of 6.8×10⁴ and 7.3×10⁵ A/m, respectively, while the SmCo₅ nanoflakes, with the mean particle size of about 1.4 μm and average thickness of 75 nm, showed excellent permanent magnetic properties with an obvious c-axis crystal texture, a strong magnetic anisotropy and high coercivity values of 5.5×10⁵ and 1.6×10⁶ A/m in their easy-axis and hard-axis directions, respectively. The coercivity values of SmCo₅ nanoparticles and nanoflakes exhibited a significant particle size dependance effect.

Key words: SmCo₅ nanoparticle nanoflake surfactant high energy ball milling magnetic property

Received: 17 October 2011

ZTFLH:

TM277

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National Natural Science Foundation of China

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00643 OR https://www.ams.org.cn/EN/Y2012/V48/I4/475

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