A facile synthesis of directly gas-phase ordered high anisotropic SmCo based non-segregated nanoalloys by cluster beam deposition method

Nadeem Abbas; Yun Li; Jian-zhong Ding; J. Ping Liu; Hu-bin Luo; Juan Du; Wei-xing Xia; Aru Yan; Fang Wang; Jian Zhang

Materials & Design (Nov 2019)

A facile synthesis of directly gas-phase ordered high anisotropic SmCo based non-segregated nanoalloys by cluster beam deposition method

Nadeem Abbas,
Yun Li,
Jian-zhong Ding,
J. Ping Liu,
Hu-bin Luo,
Juan Du,
Wei-xing Xia,
Aru Yan,
Fang Wang,
Jian Zhang

Affiliations

Nadeem Abbas: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Yun Li: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Jian-zhong Ding: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
J. Ping Liu: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Department of Physics, University of Texas at Arlington, Arlington, TX 76019, USA
Hu-bin Luo: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Juan Du: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Wei-xing Xia: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Aru Yan: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Fang Wang: Ningbo University of Technology, Ningbo, Zhejiang 315211, China
Jian Zhang: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; Corresponding author at: Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.

Journal volume & issue: Vol. 181

Abstract

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Synthesis of nanoalloys containing three or more elements with controllable size and morphology and desired phase is very challenging. Rare earth (RE)-transition metal (TM) nanoalloys have great potential applications, however, their controllable synthesis is even a daunting task. Here we find that the direct gas-phase ordering of Sm-Co-based nanoalloys (around 5–15 nm) into 1:5 phase without size and shape change can be achieved by in-flight annealing through reducing their crystallization-ordering temperature (COT) with additive Cu or Ni. The homogenous element-distribution and desired phase in these trimetallic nanoalloys are evidenced by high-resolution-transmission-electron-microscopy analysis despite a preferred surface segregation from thermodynamic calculation and analysis. Our results demonstrate a promising way to synthesize trimetallic nanoalloys especially RE-TM with independently controlled size, composition and phase as well as their building-blocks with novel functionalities. The reduction in COT of Sm-Co-Cu nanoalloys is further confirmed by post-annealing the deposited nanocluster film. A significant coercivity-enhancement is achieved at a lower annealing-temperature. Compared to FePt, the higher anisotropy and much lower COT of Sm-Co-based nanoalloy make it emerge as a promising next-generation recording media with density beyond FePt. Our study also opens a door for fabricating trimetallic or even multicomponent nanoalloys with controllable size, composition and phase. Keywords: Nanoalloys, Gas phase ordering, Crystallization temperature, Cluster beam deposition, High magnetic anisotropy

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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