Mössbauer Spectroscopy Study of the Superparamagnetism of Ultrasmall ϵ-Fe2O3 Nanoparticles Full article
| Journal |
Journal of Experimental and Theoretical Physics Letters (JETP Letters)
ISSN: 0021-3640 , E-ISSN: 1090-6487 |
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| Output data | Year: 2018, Volume: 108, Number: 8, Pages: 527-531 Pages count : 5 DOI: 10.1134/s0021364018200092 | ||||
| Tags | HIGH-TEMPERATURE; PARTICLES; EPSILON-FE2O3; PHASE; MODEL | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 17-12-01111 |
Abstract:
The superparamagnetism of an ensemble of ϵ-Fe2O3 nanoparticles with a mean size of 3.9 nm dispersed in a xerogel SiO2 matrix is studied by the Mössbauer spectroscopy method. It is shown that most nanoparticles at room temperature are in the superparamagnetic (unblocked) state. As the temperature decreases, the progressive blocking of the magnetic moments of the particles occurs, which is manifested in the Mössbauer spectra as the transformation of the quadrupole doublet into a Zeeman sextet. The analysis of the relative intensity of the superparamagnetic (quadrupole doublet) and magnetically split (sextets) spectral components in the range of 4–300 K provides the particle size distribution, which is in agreement with the transmission electron microscopy data. The values of the effective magnetic anisotropy constants (Keff) are determined, and the contribution of surface anisotropy (KS) is estimated for particles of various sizes. It is shown that the quantity Keff is inversely proportional to the particle size, which indicates the significant contribution of the surface to the magnetic state of the ϵ-Fe2O3 nanoparticles with the size of several nanometers.
Cite:
Knyazev Y.V.
, Balaev D.A.
, Kirillov V.L.
, Bayukov O.A.
, Mart’yanov O.N.
Mössbauer Spectroscopy Study of the Superparamagnetism of Ultrasmall ϵ-Fe2O3 Nanoparticles
Journal of Experimental and Theoretical Physics Letters (JETP Letters). 2018. V.108. N8. P.527-531. DOI: 10.1134/s0021364018200092 WOS Scopus РИНЦ AN OpenAlex
Mössbauer Spectroscopy Study of the Superparamagnetism of Ultrasmall ϵ-Fe2O3 Nanoparticles
Journal of Experimental and Theoretical Physics Letters (JETP Letters). 2018. V.108. N8. P.527-531. DOI: 10.1134/s0021364018200092 WOS Scopus РИНЦ AN OpenAlex
Original:
Князев Ю.В.
, Балаев Д.А.
, Кириллов В.Л.
, Баюков О.А.
, Мартьянов О.Н.
Изучение суперпарамагнетизма ультрамалых наночастиц ǫ-FE2O3 методом мессбауэровской спектроскопии
Письма в Журнал экспериментальной и теоретической физики. 2018. Т.108. №7-8. С.558-562. DOI: 10.1134/S0370274X18200067 РИНЦ
Изучение суперпарамагнетизма ультрамалых наночастиц ǫ-FE2O3 методом мессбауэровской спектроскопии
Письма в Журнал экспериментальной и теоретической физики. 2018. Т.108. №7-8. С.558-562. DOI: 10.1134/S0370274X18200067 РИНЦ
Dates:
| Submitted: | Jul 23, 2018 |
| Accepted: | Sep 7, 2018 |
| Published print: | Oct 1, 2018 |
| Published online: | Dec 29, 2018 |
Identifiers:
| Web of science: | WOS:000454566200006 |
| Scopus: | 2-s2.0-85059225828 |
| Elibrary: | 38635041 |
| Chemical Abstracts: | 2019:5246 |
| OpenAlex: | W2907503734 |