The microstructure, crystal structure, and magnetic properties of low-temperature phase (LTP) Mn-Bi nanosheets, prepared by surfactant assistant high-energy ball milling (SA-HEBM) with oleylamine and oleic acid as the surfactant, were examined with scanning electron microscopy, X-ray diffraction, and vibrating sample magnetometer, respectively. Effect of ball-milling time on the coercivity of LTP Mn-Bi nanosheets was systematically investigated. Results show that the high energy ball milling time from tens of minutes to several hours results in the coercivity increase of Mn-Bi powders and peak values of 14.3 kOe around 10 h. LTP Mn-Bi nanosheets are characterized by an average thickness of tens of nanometers, an average diameter of ∼1.5 μm, and possess a relatively large aspect ratio, an ultra-high room temperature coercivity of 22.3 kOe, a significant geometrical and magnetic anisotropy, and a strong (00l) crystal texture. Magnetization and demagnetization behaviors reveal that wall pinning is the dominant coercivity mechanism in these LTP Mn-Bi nanosheets. The ultrafine grain refinement introduced by the SA-HEBM process contribute to the ultra-high coercivity of LTP Mn-Bi nanosheets and a large number of defects put a powerful pinning effect on the magnetic domain movement, simultaneously. Further magnetic measurement at 437 K shows that a high coercivity of 17.8 kOe and a strong positive temperature coefficient of coercivity existed in the bonded permanent magnet made by LTP Mn-Bi nanosheets.
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7 May 2014
PROCEEDINGS OF THE 55TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS
14-18 November 2010
Atlanta, Georgia
Research Article|
Magnetism and Magnetic Materials|
March 05 2014
Structure and magnetic properties of low-temperature phase Mn-Bi nanosheets with ultra-high coercivity and significant anisotropy
Rongming Liu;
Rongming Liu
a)
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
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Ming Zhang;
Ming Zhang
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
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E Niu;
E Niu
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
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Zhubai Li;
Zhubai Li
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
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Xinqi Zheng;
Xinqi Zheng
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
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Rongrong Wu;
Rongrong Wu
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
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Wenliang Zuo;
Wenliang Zuo
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
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Baogen Shen;
Baogen Shen
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
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Fengxia Hu;
Fengxia Hu
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
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Jirong Sun
Jirong Sun
State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
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a)
Authors to whom correspondence should be addressed. Electronic addresses: [email protected] and [email protected].
J. Appl. Phys. 115, 17A742 (2014)
Article history
Received:
September 23 2013
Accepted:
November 22 2013
Citation
Rongming Liu, Ming Zhang, E Niu, Zhubai Li, Xinqi Zheng, Rongrong Wu, Wenliang Zuo, Baogen Shen, Fengxia Hu, Jirong Sun; Structure and magnetic properties of low-temperature phase Mn-Bi nanosheets with ultra-high coercivity and significant anisotropy. J. Appl. Phys. 7 May 2014; 115 (17): 17A742. https://doi.org/10.1063/1.4866843
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