Preparation and Properties of Nd-Fe-B/Fe Nanocomposite Magnets |
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| Affiliation: | 1. Department of Physics, Federal University of Amazonas, Av. Rodrigo Octavio 3000-Japiim, 69077-000 Manaus, AM, Brazil;2. Department of Physics, University of North Texas, 1155 Union Circle 311427, Denton, TX 76203, USA;3. Department of Mathematics, Federal University of Amazonas, Av. Rodrigo Octavio 3000-Japiim, 69077-000 Manaus, AM, Brazil;1. Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei, 066004, China;2. Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China;3. Departamento de Física Aplicada-ICMUV, MALTA Consolider Team, Universidad de Valencia, Edificio de Investigación, C/Dr. Moliner 50, Burjassot, 46100, Valencia, Spain;4. Institute of Materials Science (ICMUV), University of Valencia, Catedratico Beltran 2, E-46980, Valencia, Spain;5. School of Physics and Optoelectronic Engineering, University of Chinese Academy of Sciences, China |
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| Abstract: | Nd-Fe-B/α-Fe nanocomposite magnets with high magnetic properties were successfully fabricated through a sonochemical process with carbonyl iron as Fe precursor and subsequently SPS. Experimental results show that α-Fe can increase the remanence of Nd-Fe-B/α-Fe nanocomposite magnets while decrease the coercivity. The demagnetizing curve indicates that the hard and the soft phases did not coupled very well, even though the remanence was improved. The magnetic properties of Br 8.61 kGs, Hcj 8.59 kOe and (BH)max 12.05 MGOe were obtained for Nd-Fe-B/α-Fe nanocomposite magnets with the nominal Fe content of 5 wt.%. It is noted, the exchange coupling was obviously enhanced by a MA process before SPS, and the magnets properties were increased to Br 9.42 kGs and (BH)max 14.27 MGOe for Nd-Fe-B/α-Fe nanocomposite magnets with the same Fe content. |
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