Nano Archive

Investigation of nanocomposite materials with ultrasoft and high performance hard magnetic properties

Chau, N and Chien, N. X. and Hoa, N. Q. and Niem, P. Q. and Luong, N. H. and Tho, N. D. and Tho, N. D. (2004) Investigation of nanocomposite materials with ultrasoft and high performance hard magnetic properties. Journal of Magnetism and Magnetic Materials, 282 . pp. 174-179.

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Abstract

In the system of Fe73.5xCoxNb3Cu1Si13.5B9 (x ¼ 0; 2, 4, 6, 8) withincreasing Co content the size of nano-particles in heat-treated ribbons, the Curie temperatures of amorphous phase and crystalline phase, and volume fraction of the heat-treated ribbons of a-Fe(Si) phase increase while the crystallization activation energy of a-Fe(Si) phase decreases. The presence of Co substituted for Fe makes the crystalline phase to be formed easily. Ultrasoft magnetic properties are established in the samples. The as-cast Nd4.5Fe73.8B18.5Co2Nb1Cu0.2 ribbons are thermal-annealed in the range of 580–620C for obtaining multiphase materials. After annealing at 610C in 20 min, HC reaches 2.9 kOe, Br ¼ 11:9 kG, the reduced remanent ratio Mr=Ms ¼ 0:76 and maximum energy product ðBHÞmax ¼ 15:2 MGOe.

Item Type:Article
Subjects:Material Science > Nanostructured materials
ID Code:4553
Deposited By:CSMNT
Deposited On:07 Apr 2009 10:34
Last Modified:07 Apr 2009 10:36

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