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Magnetic Granulometry and Super-Paramagnetism
Abstract
The magnetic technique of particle size measurement based on the work of Elmore consists of a comparison of a modified Langevin curve with the observed magnetization curve for an appropriate system of ferromagnetic particles. The average magnetic moment per particle is obtained from this analysis, and the average particle size is thus determined. The prediction by Néel of thermal relaxation in single-domain ferromagnetic particles broadens the range of applicability of the granulometry method, with special emphasis on the size range from 20 A to about 100 A. A possible objection to the method, arising from evidence for an abnormal temperature dependence of the saturation magnetization of very small magnetic particles, is re-examined experimentally and found to be invalid. Several examples are presented that demonstrate the predicted thermal relaxation and that point to a wide utilization of the granulometry technique.
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Citations
Cited by
Bean, C. P., & Livingston, J. D. (1959) · Journal of Applied Physics · doi:10.1063/1.2185850 · Cited by 1,773
Self-citationFundamentals and application of magnetic particles in cell isolation and enrichment: a review
Plouffe, B. D., Murthy, S. K., & Lewis, L. H. (2015) · Reports on Progress in Physics · doi:10.1088/0034-4885/78/1/016601 · Cited by 334
Metadata
- Authors
- Bean, C. P., & Jacobs, I. S.
- Venue
- Journal of Applied Physics
- Publisher
- AIP Publishing
- Published
- 1956-12-01
- Volume
- 27
- Issue
- 12
- Pages
- 1448-1452
- ISSN
- 0021-8979 (ISSN-L)
- 1089-7550
- OpenAlex
- W2025284799
- Cited by
- 231
- References
- 0
- FWCI
- 3.71
- Type
- journal article
- Language
- en
- Open access
- closed
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- Bean, C. P., & Jacobs, I. S. (1956). Magnetic Granulometry and Super-Paramagnetism. Journal of Applied Physics. https://doi.org/10.1063/1.1722287
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