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Overview

R. W. McCallum is affiliated with the Ames Laboratory in the United States and contributes research primarily in the fields of Materials Science, Chemistry, and Physics and Astronomy. Their work spans several subfields including Electronic, Optical and Magnetic Materials, Materials Chemistry, Organic Chemistry, Condensed Matter Physics, and Inorganic Chemistry.

Their research topics predominantly cover Magnetic Properties of Alloys, Magnetic and Transport Properties of Perovskites and Related Materials, Rare-earth and Actinide Compounds, Magnetic Properties and Applications, Inorganic Chemistry and Materials, Catalytic Processes in Materials Science, and Magnetic Properties of Thin Films.

Recent publications by McCallum include:

  • Towards additive manufacturing of magnetocaloric working materials, 2021, Materialia
  • Estimating the in-operando stabilities of AlFe2B2-Based compounds for magnetic refrigeration, 2020, Journal of Alloys and Compounds
  • Reinvestigation of the intrinsic magnetic properties of (Fe1-xCox)2B alloys and crystallization behavior of ribbons, 2020, Journal of Magnetism and Magnetic Materials
  • Borderline first-order magnetic phase transition in AlFe2B2, 2021, Journal of Alloys and Compounds
  • Base-free palladium-catalyzed borylation of enol carboxylates and further reactivity toward deboronation and cross-coupling, 2025, Tetrahedron

McCallum frequently collaborates with other researchers. Some of their frequent coauthors include B.T. Lejeune, Radhika Barua, L. H. Lewis, M. J. Kramer, and Emrah Simsek.

Their research has appeared in several key publication venues, most notably:

  • Journal of Alloys and Compounds
  • Journal of Magnetism and Magnetic Materials
  • Materialia
  • Tetrahedron

The breadth of McCallum's work intersects materials science and chemistry, with a strong emphasis on magnetic properties and related functional materials. Their involvement includes experimental investigations into magnetocaloric materials, alloy magnetic phase transitions, and catalytic processes relevant to material synthesis and modification.

Best Publications

  • Cerium: An Unlikely Replacement of Dysprosium in High Performance Nd–Fe–B Permanent Magnets

    Arjun K. Pathak;Mahmud Khan;Karl A. Gschneidner;Karl A. Gschneidner;Ralph W. McCallum

  • Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

    M. J. Kramer;R. W. McCallum;I. A. Anderson;S. Constantinides

  • Structural transition and anisotropic properties of single-crystalline SrFe2As2

    J.-Q. Yan;Andreas Kreyssig;Shibabrata Nandi;N. Ni

  • Hole filling, charge transfer and superconductivity in Nd1+xBa2−xCu3O7+δ

    M.J. Kramer;S.I. Yoo;R.W. McCallum;W.B. Yelon

  • Architecture and magnetism of alnico

    Lin Zhou;M. K. Miller;Ping Lu;Liqin Ke

  • Phase diagram in the Nd-Ba-Cu-O system

    S.I. Yoo;R.W. McCallum

  • Substitutions for Cu in YBa2(Cu1−xMx)3O7−δ (M = Fe, Co, Al, Cr, Ni, and Zn)

    Youwen Xu;R.L. Sabatini;A.R. Moodenbaugh;Yimei Zhu

  • Metal-bonded Co-ferrite composites for magnetostrictive torque sensor applications

    Y. Chen;J.E. Snyder;C.R. Schwichtenberg;K.W. Dennis

  • High performance isotropic permanent magnet based on Nd-Fe-B

    R. W. McCallum;A. M. Kadin;G. B. Clemente;J. E. Keem

  • Magnetic properties of bulk, and rapidly solidified nanostructured (Nd1-xCex)2Fe14-yCoyB ribbons

    Arjun K. Pathak;M. Khan;K.A. Gschneidner;K.A. Gschneidner;R.W. McCallum

  • Preparation, crystal structure, heat capacity, magnetism, and the magnetocaloric effect of Pr5Ni1.9Si3 and PrNi

    A. O. Pecharsky;Yu. Mozharivskyj;K. W. Dennis;K. A. Gschneidner

  • Effect of atmosphere and rare earth on liquidus relations in RE–Ba–Cu Oxides

    J. E. Ullman;R. W. McCallum;J. D. Verhoeven

  • Influence of solidification microstructure on the magnetic properties of Ni–Mn–Sn Heusler alloys

    D.L. Schlagel;R.W. McCallum;T.A. Lograsso

  • Effect of the elastic modulus of the matrix on magnetostrictive strain in composites

    Y. Chen;J. E. Snyder;C. R. Schwichtenberg;K. W. Dennis

  • Composite Magnetostrictive Materials For Advanced Automotive Magnetomechanical Sensors

    R. W. McCallum;K. W. Dennis;David Jiles;John Evan Snyder

  • Confirmation of quadrupolar transitions in circular magnetic x-ray dichroism at the dysprosium LIII edge.

    J. C. Lang;George Srajer;C. Detlefs;A. I. Goldman

  • Flux growth at ambient pressure of millimeter-sized single crystals of LaFeAsO, LaFeAsO1-xFx, and LaFe1-xCoxAsO

    J.-Q. Yan;S. Nandi;J. L. Zarestky;W. Tian

  • Temperature dependence of the magnetic anisotropy and magnetostriction of Fe100−xGax (x=8.6, 16.6, 28.5)

    A. E. Clark;M. Wun-Fogle;J. B. Restorff;K. W. Dennis

  • Giant magnetic anisotropy and tunnelling of the magnetization in Li2(Li1−xFex)N

    A. Jesche;R. W. McCallum;S. Thimmaiah;J. L. Jacobs

  • Rapid solidification and metallic glass formation – Experimental and theoretical limits

    M.J. Kramer;H. Mecco;K.W. Dennis;E. Vargonova

Frequent Co-Authors

Matthew J. Kramer
Matthew J. Kramer Ames Laboratory
Alan I. Goldman
Alan I. Goldman Iowa State University
Jiaqiang Yan
Jiaqiang Yan Oak Ridge National Laboratory
David Jiles
David Jiles Iowa State University
Thomas A. Lograsso
Thomas A. Lograsso Ames Laboratory
Vitalij K. Pecharsky
Vitalij K. Pecharsky Iowa State University
Karl A. Gschneidner
Karl A. Gschneidner Iowa State University
Ruslan Prozorov
Ruslan Prozorov Iowa State University
Paul C. Canfield
Paul C. Canfield Iowa State University
Michael K Miller
Michael K Miller Oak Ridge National Laboratory

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