Structure and magnetic properties of bulk nanocrystalline Tm{sub 2}(Co{sub 1-x}Fe{sub x}){sub 17} permanent magnet

Journal Article · Sat May 15 00:00:00 EDT 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3334542· OSTI ID:21476205

Zhang, D T ^[1]; Yang, J J; Yue, M; Cao, S; Liu, W Q; Zhang, J X ^[1]; Yi, X F ^[2]; Qiang, Y ^[3]

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1. School of Material Science and Engineering, Beijing University of Technology, Beijing 100124 (China)
2. Anhui Earth-Panda Advance Magnetic Material Co., Ltd., Anhui 231500 (China)
3. Department of Physics, University of Idaho, Moscow, Idaho 83844-0903 (United States)

Structure and magnetic properties were studied for Tm{sub 2}(Co{sub 1-x}Fe{sub x}){sub 17} bulk nanocrystalline magnet synthesized by spark plasma sintering technique. X-ray diffraction results indicate both ingot and sintered magnet of Tm{sub 2}(Co{sub 0.7}Fe{sub 0.3}){sub 17} alloy exhibit hexagonal Th{sub 2}Ni{sub 17} type structure. The microstructure of the magnet is composed of Th{sub 2}Ni{sub 17} type nanograins with an average size of 35 nm detected by transmission electron microscopy and selected area electron diffraction patterns. Magnetic measurement shows that the remanence of the magnet is higher at 573 K than at 300 K, indicating there is a positive remanence temperature coefficient in the magnet. The anisotropy field of Tm{sub 2}(Co{sub 0.7}Fe{sub 0.3}){sub 17} alloy is 3.8 T, which is much higher than the H{sub A} of 2.3 T for the pure Tm{sub 2}Co{sub 17} alloy. The coercivity of the sintered magnet increases from 0.25 to 0.354 T after optimal annealing.

• OSTI ID: 21476205
• Journal Information: Journal of Applied Physics, Vol. 107, Issue 9; Conference: 11. joint MMM-Intermag conference, Washington, DC (United States), 18-22 Jan 2010; Other Information: DOI: 10.1063/1.3334542; (c) 2010 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ANISOTROPY
ANNEALING
COBALT ALLOYS
COERCIVE FORCE
CONCENTRATION RATIO
CRYSTALS
ELECTRON DIFFRACTION
IRON ALLOYS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MICROSTRUCTURE
NANOSTRUCTURES
NICKEL ALLOYS
PLASMA
SINTERING
THORIUM ALLOYS
THULIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ACTINIDE ALLOYS
ALLOYS
COHERENT SCATTERING
DIFFRACTION
DIMENSIONLESS NUMBERS
ELECTRON MICROSCOPY
FABRICATION
HEAT TREATMENTS
MATERIALS
MICROSCOPY
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SCATTERING
TRANSITION ELEMENT ALLOYS