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Magnetic properties of ultrafine iron particles
Abstract
The magnetic and morphological properties of fine Fe particles have been studied. Ultrafine particles of Fe were prepared using a vapor deposition technique under an argon atmosphere. The argon pressure was varied from 0.5 to 8 Torr during evaporation, and samples with a median diameter in the range 50--200 \AA{} were obtained having a log-normal distribution. The dependence of magnetic properties on particle size and temperature (10 KT300 K) were studied using superconducting-quantum-interference-device magnetometry and M\"ossbauer spectroscopy. Samples with particle diameter below 90 \AA{} showed a superparamagnetic behavior below room temperature. The saturation magnetization of the particles varied from 25 to 190 emu/g, with the higher values corresponding to larger particles. For these larger particles, a coercivity of 1.05 kOe was obtained at room temperature. The magnetic and structural data suggested a core-shell type of structure, where the core consists of metallic Fe and the shell is composed of Fe oxides.
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Cited by
Exchange bias in nanostructures
Nogués, J., Sort, J., Langlais, V., Skumryev, V., Suriñach, S., Muñoz, J. S., & Baró, M. D. (2005) · Physics Reports · doi:10.1016/j.physrep.2005.08.004 · Cited by 1,925
Controlling exchange bias in Fe3O4/FeO composite particles prepared by pulsed laser irradiation
Swiatkowska-Warkocka, Z., Kawaguchi, K., Wang, H., Katou, Y., & Koshizaki, N. (2011) · Nanoscale Research Letters · doi:10.1186/1556-276x-6-226 · Cited by 71
Metadata
- Authors
- Gangopadhyay, S., Hadjipanayis, G. C., Dale, B., Sorensen, C. M., Klabunde, K. J., Papaefthymiou, V., & Kostikas, A.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 1992-05-01
- Volume
- 45
- Issue
- 17
- Pages
- 9778-9787
- ISSN
- 0163-1829 (ISSN-L)
- 1095-3795
- OpenAlex
- W1993271979
- Cited by
- 506
- References
- 0
- FWCI
- 16.23
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Magnetic properties of ultrafine iron particles. https://app.cochat.ai/papers/10.1103/physrevb.45.9778
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- Gangopadhyay, S., Hadjipanayis, G. C., Dale, B., Sorensen, C. M., Klabunde, K. J., Papaefthymiou, V., & Kostikas, A. (1992). Magnetic properties of ultrafine iron particles. Physical Review B. https://doi.org/10.1103/physrevb.45.9778
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