The Low-Temperature Magnetic State and Magnetic Ordering Temperature of ε-Fe2O3 Iron Oxide Nanoparticles Full article
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IEEE Magnetics Letters
ISSN: 1949-307X , E-ISSN: 1949-3088 |
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| Output data | Year: 2019, Volume: 10, Article number : 6110103, Pages count : 3 DOI: 10.1109/LMAG.2019.2956674 | ||||
| Tags | Fe2O3 nanoparticles; FMR spectra; magnetic transition | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 17-12-01111 |
Abstract:
The ϵ-Fe2O3 iron oxide polymorph is a well-known magnetic material with a complex magnetic structure, which undergoes a series of magnetic transitions in different temperature ranges. However, the ϵ-Fe2O3 phase diagram is still unclear. We report on the magnetic properties of a sample consisting of ϵ-Fe2O3 nanoparticles with an average size of 8 nm embedded in a SiO2 xerogel matrix without an admixture of foreign phases. Along with the features typical of the well-known ϵ-Fe2O3 magnetic transition in the temperature range 80–150 K, the temperature dependence of magnetization M ( T ) of ϵ-Fe 2 O 3 includes other low-temperature anomalies. In an external field of H = 70 kOe, there is a noticeable temperature hysteresis of magnetization at 50–90 K, and near T ≈ 50 K, the M ( T ) curves have a characteristic bending, which may be indicative of an additional magnetic transition. The ferromagnetic resonance spectra shows that, near 500 K, a magnetic phase transition occurs, which was previously thought to be a transition to the paramagnetic state. An analysis of the temperature dependence of the ferromagnetic resonance spectra shows that the magnetically ordered phase in ϵ-Fe2O3 exists up to about 800 K.
Cite:
Dubrovskiy A.A.
, Semenov S.V.
, Knyazev Y.V.
, Popkov S.I.
, Yakushkin S.S.
, Kirillov V.L.
, Martyanov O.N.
, Balaev D.A.
The Low-Temperature Magnetic State and Magnetic Ordering Temperature of ε-Fe2O3 Iron Oxide Nanoparticles
IEEE Magnetics Letters. 2019. V.10. 6110103 :1-3. DOI: 10.1109/LMAG.2019.2956674 WOS Scopus РИНЦ AN OpenAlex
The Low-Temperature Magnetic State and Magnetic Ordering Temperature of ε-Fe2O3 Iron Oxide Nanoparticles
IEEE Magnetics Letters. 2019. V.10. 6110103 :1-3. DOI: 10.1109/LMAG.2019.2956674 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Oct 3, 2019 |
| Accepted: | Oct 30, 2019 |
| Published online: | Nov 29, 2019 |
Identifiers:
| Web of science: | WOS:000505528100001 |
| Scopus: | 2-s2.0-85075953921 |
| Elibrary: | 43215216 |
| Chemical Abstracts: | 2020:2145864 |
| OpenAlex: | W2991641388 |