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Boudart M, Dumesic JA, Topsøe H. Surface, catalytic, and magnetic properties of small iron particles: The effect of chemisorption of hydrogen on magnetic anisotropy. Proc Natl Acad Sci U S A. 1977;74(3):806-10doi: 10.1073/pnas.74.3.806.
Boudart, M., Dumesic, J. A., & Topsøe, H. (1977). Surface, catalytic, and magnetic properties of small iron particles: The effect of chemisorption of hydrogen on magnetic anisotropy. Proceedings of the National Academy of Sciences of the United States of America, 74(3), 806-10. https://doi.org/10.1073/pnas.74.3.806
Boudart, M, et al. "Surface, catalytic, and magnetic properties of small iron particles: The effect of chemisorption of hydrogen on magnetic anisotropy." Proceedings of the National Academy of Sciences of the United States of America vol. 74,3 (1977): 806-10. doi: https://doi.org/10.1073/pnas.74.3.806
Boudart M, Dumesic JA, Topsøe H. Surface, catalytic, and magnetic properties of small iron particles: The effect of chemisorption of hydrogen on magnetic anisotropy. Proc Natl Acad Sci U S A. 1977 Mar;74(3):806-10. doi: 10.1073/pnas.74.3.806. PMID: 16592390; PMCID: PMC430481.
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Proc Natl Acad Sci U S A. 1977 Mar;74(3):806-10. doi: 10.1073/pnas.74.3.806.

Surface, catalytic, and magnetic properties of small iron particles: The effect of chemisorption of hydrogen on magnetic anisotropy.

Proceedings of the National Academy of Sciences of the United States of America

M Boudart, J A Dumesic, H Topsøe

Affiliations

  1. Stauffer Laboratories of Chemistry and Chemical Engineering, Stanford University, Stanford, California 94305.

PMID: 16592390 PMCID: PMC430481 DOI: 10.1073/pnas.74.3.806

Abstract

The superparamagnetic behavior of very small particles of metallic iron (ca 1.5 nm), with about half of their atoms at the surface, is changed reversibly by adsorption and desorption of hydrogen below the superparamagnetic transition temperature. The change after adsorption implies a lowering of the anisotropy energy barrier for the magnetic relaxation of iron and is ascribed to a change in crystalline shape. No such changes are observed for larger particles of iron (ca 8 nm) with about 10% of their atoms at the surface.

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