PERSONAL HISTORY
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.

RESEARCH INTERESTS
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.

SELECTED PUBLICATIONS
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).

HONORS, AWARDS AND PROFESSIONAL ACTIVITIES