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R. William McCallum
Ames Laboratory-USDOE
Senior Materials Scientist
Magnetism Focus Area
Iowa State University
Adjunct Professor
Materials Science and Engineering
106 Wilhelm
Tel: 515-294-4736
Fax: 515-294-4291

B.A. 1969, Mathematics and Physics, Carleton College; M.S. 1973, Ph.D. 1977, Solid State Physics, University of California, San Diego; NSF Postdoctoral Research Fellow, University of California, San Diego, 1977-78; Scientific Staff Member, IFF-KFA Jülich, 1978-82; Senior Scientist, Energy Conversion Devices, Inc., 1982-86; Ames Laboratory, 1986-present; Director, Rare-earth Information Center, 1996-2002. Visiting Scientist, National Research Institute for Metals, Tokyo, Japan , 1988; Visiting Scientist, International Superconductivity Technology Center, Tokyo, Japan , 1996.

Magnetic and electronic properties of ternary rare earth compounds, permanent magnet materials, development of microstructure during rapid solidification processing, high temperature superconductors, effect of microstructure on magnetic and superconducting properties, and composite magnetostrictive materials.

M. Huang, D. Wu, K.W. Dennis, J.W. Anderegg, R.W. McCallum, and T.A. Lograsso
“The Pr-rich portion of the Ni-Pr system,” J. Phase Equilib. Diffusion, Vol. 26 (3), 209 (2005).

S.H. Song, D.C. Jiles, J.E. Snyder, A.O. Pecharsky, D. Wu, K.W. Dennis, T.A. Lograsso, and R.W. McCallum
“Thermal expansion and Gruneisen parameters in some Pr-Ni-Si compounds,” J. Appl. Phys., Vol. 97 (10, Pt. 1), 10M516-1 (2005).

R.W. McCallum
“Determination of the saturation magnetization, anisotropy field, mean field interaction, and switching field distribution for nanocrystalline hard magnets,” J. Magn. Magn. Mater., Vol. 292, 135 (2005).

W. Tang, K.W. Dennis, Y.Q. Wu, M.J. Kramer, I.E. Anderson, and R.W. McCallum
“Studies of new YDy-based R2Fe14B magnets for high temperature performance (R= Y + Dy + Nd),” Ames Laboratory, Iowa State University, Ames, IA, USA, IEEE Trans. Magn., Vol. 40 (4, Pt. 2), 2907 (2004).

A.O. Pecharsky, Y. Mozharivskyj, K.W. Dennis, K.A. Gschneidner, Jr., R.W. McCallum, G.J. Miller, and V.K. Pecharsky
“Preparation, crystal structure, heat capacity, magnetism, and the magnetocaloric effect of Pr5Ni1.9Si3 and PrNi,” Phys. Rev. B: Condens. Matter Mater. Physics, Vol. 68 (13), 134452/1 (2003).


  • Department of Energy’s Materials Sciences Award, Sustained Outstanding Research in Solid State Physics, 1995
  • Department of Energy’s Materials Sciences Award, Significant Implication for DOE Related Technologies, Materials and Engineering Physics, 1996
  • R&D 100 Award, “Nanocrystalline Composite Coercive Magnet Powders,” 1997