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Microstructure evolution in Pr-Co-C-Ti nanophase magnets

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Abstract.

The microstructures of nanophase Pr-Co-C-(Ti) materials, which have improved magnetic properties, were investigated by means of transmission electron microscopy (TEM) to reveal their phase assemblage and grain-boundary structure. The phase assemblage was carefully controlled by the introduction of TiC nanoparticles and annealing. The optimal nanostructure contained uniformly distributed PrCo5 and PrCo2 nanophases without any magnetically soft phases, resulting in high coercivity and the characteristics of a single, hard magnetic phase. TEM analysis confirmed the presence of an amorphous grain-boundary phase surrounding the grains in alloys without TiC. In contrast, alloys with added TiC showed no amorphous phase and also showed higher coercivity compared to Co-Pr-C. Therefore, the variation of the grain boundary phases may be effective in changing the degree of exchange coupling. Controlling the formation of a uniform nanoscale microstructure, leading to improved magnetic properties, is discussed.

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Authors and Affiliations

  1. Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA, , , , , , US

    Y.L. Tang & D.J. Miller

  2. Idaho National Engineering and Environment Laboratory, Idaho Falls, ID 83415, USA, , , , , , US

    D.J. Branagan

  3. Ames Laboratory and the Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA, , , , , , US

    M.J. Kramer & R.W. McCallum

Authors
  1. Y.L. Tang
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  2. D.J. Branagan
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  3. D.J. Miller
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  4. M.J. Kramer
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  5. R.W. McCallum
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Additional information

Received: 5 September 2002 / Accepted: 10 September 2002 / Published online: 22 January 2003

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ID="*"Corresponding author. Fax: +1-630/252-7777, E-mail: ytang@anl.gov

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Tang, Y., Branagan, D., Miller, D. et al. Microstructure evolution in Pr-Co-C-Ti nanophase magnets . Appl Phys A 76, 987–989 (2003). https://doi.org/10.1007/s00339-002-1988-1

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  • DOI: https://doi.org/10.1007/s00339-002-1988-1

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