DOI: 10.1063/1.1723112. Loss of Exchange Coupling in the Surface Layers of Ferromagnetic Particles

Loss of Exchange Coupling in the Surface Layers of Ferromagnetic Particles

10.1063/1.1723112

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

Experiments with spherical iron particles 28 A to 265 A in diameter demonstrate that the proposed nonferromagnetic surface layer on an iron particle must be less than 1 A thick, i.e., about one atomic radius. This conclusion is based upon a comparison of the ferromagnetic iron calculated from the magnetic saturation, and the total amount of iron as determined by chemical analysis. The 1/H extrapolation of the magnetic induction appears adequate to obtain the saturation induction at room temperature of particles greater than about 100 A in diameter. For particles less than this size, in the superparamagnetic size range, the Langevin function must be used taking into account the size distribution of the particles in the sample. Thus there will be a negligible decrease in saturation induction due to the loss of exchange coupling at the surface of iron particles in the size range above 100 A of interest for fine-particle permanent magnets.

Bibliography

Luborsky, F. E. (1958). Loss of Exchange Coupling in the Surface Layers of Ferromagnetic Particles. Journal of Applied Physics, 29(3), 309â310.

Authors 1

F. E. Luborsky (first)

References 9 Referenced 11

10.1103/PhysRev.81.378 / Phys. Rev. (1951)
10.1063/1.1722860 / J. Appl. Phys. (1957)
10.1103/RevModPhys.25.310 / Revs. Modern Phys. (1953)
{'key': '2024020121385692100_r2b', 'first-page': '3', 'volume': '2', 'year': '1953', 'journal-title': 'Trans. Danish Acad. Tech. Sci.'} / Trans. Danish Acad. Tech. Sci. (1953)
10.1103/PhysRev.106.890 / Phys. Rev. (1957)
{'key': '2024020121385692100_r4', 'first-page': '334', 'volume': '7a', 'year': '1952', 'journal-title': 'Z. Naturforsch.'} / Z. Naturforsch. (1952)
10.1063/1.1722287 / J. Appl. Phys. (1956)
{'key': '2024020121385692100_r6', 'first-page': '59', 'volume': '209', 'year': '1957', 'journal-title': 'J. Metals, Trans. Am. Inst. Mining Met. Engrs.'} / J. Metals, Trans. Am. Inst. Mining Met. Engrs. (1957)
10.1021/j150556a017 / J. Phys. Chem. (1957)

Dates

Type	When
Created	20 years, 4 months ago (April 22, 2005, 12:12 p.m.)
Deposited	1 year, 6 months ago (Feb. 1, 2024, 5:35 p.m.)
Indexed	1 year, 6 months ago (Feb. 1, 2024, 6:21 p.m.)
Issued	67 years, 5 months ago (March 1, 1958)
Published	67 years, 5 months ago (March 1, 1958)
Published Print	67 years, 5 months ago (March 1, 1958)

Funders 0

None

BibTeX

@article{Luborsky_1958, title={Loss of Exchange Coupling in the Surface Layers of Ferromagnetic Particles}, volume={29}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.1723112}, DOI={10.1063/1.1723112}, number={3}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Luborsky, F. E.}, year={1958}, month=mar, pages={309–310} }

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