Hysteresis Modeling of Nanocrystalline NdFeB Magnets

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• 作者：M. F. de Campos (1)
  S. A. Romero (2)
  F. A. S. da Silva (1)
  J. A. de Castro (1)
  
  1. Department of Mechanical Engineering ; Federal Fluminense University ; PUVR ; Av dos Trabalhadores 420 鈥?Vila Santa Cecilia ; Volta Redonda ; RJ ; 27255-125 ; Brazil
  2. Institute of Physics ; University of Sao Paulo ; Sao Paulo ; SP ; Brazil
  
• 关键词：NdFeB ; Magnets ; Hysteresis ; Exchange coupling ; Stoner ; Wohlfarth
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：28
• 期：3
• 页码：847-850
• 全文大小：884 KB
• 参考文献：1. Callen, E, Cullen, YJ, Liu, JR (1977) Phys. Rev. B 16: pp. 263 CrossRef
  2. Stoner, EC, Wohlfarth, EP (1991) IEEE Trans. Magn. 27: pp. 3475 CrossRef
  3. Campos, MF, Romero, SA, Landgraf, FJG, Missell, FP (2011) J. Phys. Conf. Ser. 303: pp. 012049 CrossRef
  4. Silva, FAS, Castro, NA, Campos, MF (2013) J. Magn. Magn. Mat. 328: pp. 53 CrossRef
  5. Kneller, EF, Kawig, R (1991) IEEE Trans. Magn. 27: pp. 3588 CrossRef
  6. McCallum, RW (2005) J. Magn. Magn. Mater. 292: pp. 135 CrossRef
  7. Chikazumi, S.: Physics of ferromagnetism, 2nd Edn (2009)
  8. Sagawa, M, Hirosawa, S, Yamamoto, H, Fujimura, S, Matsuura, Y (1987) Jap. J. Appl. Phys. 26: pp. 785 CrossRef
  9. Romero, SA, Campos, MF, Castro, JA, Moreira, AJ, Landgraf, FJG (2013) J. Alloys Compds. 551: pp. 312 CrossRef
  10. Fukunaga, H, Yamamoto, I, Nakano, M, Yanai, T (2012) J. Appl. Phys. 111: pp. 07A733 CrossRef
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

It is discussed the modeling of hysteresis curves of nanocrystalline exchange coupled NdFeB magnets. The hysteresis was measured with an applied field of 9 T, using a vibrating sample magnetometer with superconducting coil. The demagnetizing curve of the first quadrant of the hysteresis was fitted using the Stoner-Wohlfarth (SW) model with the Callen-Liu-Cullen (CLC) modification. Interaction effects as exchange coupling of Nd2(FeCo)14B phase with the alpha iron phase were determined. The volume fraction of the soft phase can be accounted with the CLC model. Feasible methods for improving the maximum energy product (BHmax) of rare-earth transition metal magnets with the help of the SW-CLC model data are discussed.