R. William McCallum

None
Address
106 Wilhelm Hall
The Ames Laboratory
Ames, IA 50011-3020
Phone 515-294-4736
Fax 515-294-4291
Email mccallum@ameslab.gov

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
  • Composite magnetostrictive materials
  • Preparation pathways for novel materials
  • Growth of single crystals of novel materials

        Project Affiliations:

(Chronologically most recent on top)Education

  • Postdoctoral Fellowship: Institute for Pure and Applied Physical Sciences, University of California, San Diego, 1977 - 1978
  • Ph.D. Physics, University of California, San Diego, 1977
  • M.S. Physics, University of California, San Diego, 1973
  • B.A. Mathematics and Physics, Carleton College, 1969

(Chronologically most recent on top)Professional Appointments

  • 1986 - present Senior Materials Scientist, Ames Laboratory, USDOE, Iowa State University
  • 1991 - present Adjunct Professor, Materials Science and Engineering Dept., Iowa State University
  • 1992 - 1996 Director, Rare-earth Information Center, Iowa State University, Ames, IA
  • 1987 - 1991 Adjunct Associate Professor, Materials Science and Engineering Dept., Iowa State University
  • 1982 - 1986 Senior Research Physicist, Energy Conservation Devices, Troy, MI
  • 1978 - 1982 Scientific Staff Member, Institut fur Festkorperforshung der Kernforschungsanlage Julich, Julich, West Germany.

(Chronologically most recent on top)Honors & Awards

  • 1997 R&D 100 Award, Nanocrystalline Composite Coercive Magnet Powders
  • 1996 DOE Materials Sciences Award, Significant Implication for DOE Related Technologies, Metallurgy and Ceramics
  • 1996 STE Short Term Fellow International Superconductivity Technology Center, Tokyo, Japan
  • 1995 DOE Materials Sciences Award, Sustained Outstanding Research in Solid State Physics
  • 1988 STE Short Term Fellow National Research Institute for Metals, Tokyo, Japan

(Chronologically most recent on top)Publications with the Ames Laboratory

2011
Yan J-Q; Xing Q; Jensen B; Xu H; Dennis K W; McCallum R W; Lograsso T A . 2011. Contamination from Magnetic Starting Materials in Flux-grown Single Crystals of RFeAsO Superconductors. Physical Review B. 84:012501. abstract
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Wu Y Q; Tang W; Dennis K W; Oster N; McCallum R W; Anderson I E; Kramer M J . 2011. Effective grain pinning revealed by nanoscale electron tomography. Journal of Applied Physics. 109:07a705. abstract
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Tang W; Wu Y Q; Dennis K W; Oster N T; Kramer M J; Anderson I E; McCallum R W . 2011. Studies of microstructure and magnetic properties in sintered mixed rare earth (MRE) -Fe-B magnets (MRE = Nd plus La plus Dy). Journal of Applied Physics. 109:07a704. abstract
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Yan J Q; Jensen B; Dennis K W; McCallum R W; Lograsso T A . 2011. Flux requirements for the growth of RFeAsO (R=rare earth) superconductors. Applied Physics Letters. 98:072504. abstract
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2010
Liu C; Lee Y; Palczewski A D; Yan J Q; Kondo T; Harmon B N; McCallum R W; Lograsso T A; Kaminski A . 2010. Surface-driven electronic structure in LaFeAsO studied by angle-resolved photoemission spectroscopy. Physical Review B. 82:075135. abstract
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Tian W; Ratcliff W; Kim M G; Yan J Q; Kienzle P A; Huang Q; Jensen B; Dennis K W; McCallum R W; Lograsso T A; McQueeney R J; Goldman A I; Lynn J W; Kreyssig A . 2010. Interplay of Fe and Nd magnetism in NdFeAsO single crystals. Physical Review B. 82:060514. abstract
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Li H F; Tian W; Yan J Q; Zarestky J L; McCallum R W; Lograsso T A; Vaknin D . 2010. Phase transitions and iron-ordered moment form factor in LaFeAsO. Physical Review B. 82:064409. abstract
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Ricci A; Poccia N; Joseph B; Barba L; Arrighetti G; Ciasca G; Yan J Q; McCallum R W; Lograsso T A; Zhigadlo N D; Karpinski J; Bianconi A . 2010. Structural phase transition and superlattice misfit strain of RFeAsO (R=La, Pr, Nd, Sm). Physical Review B. 82:144507. abstract
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Tang W; Wu Y Q; Oster N T; Dennis K W; Kramer M J; Anderson I E; McCallum R W . 2010. Improved energy product in grained aligned and sintered MRE2Fe14B magnets (MRE=Y plus Dy plus Nd). Journal of Applied Physics. 107:09a728. abstract
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Yuhasz W M; Schlagel D L; Xing Q; McCallum R W; Lograsso T A . 2010. Metastability of ferromagnetic Ni-Mn-Sn Heusler alloys. Journal of Alloys and Compounds. 492:681-684. abstract
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