Dynamic Magnetization of ε-Fe2O3 in Pulse Field: Evidence of Ssurface Effect | Sciact - CRIS-system of Boreskov Institute of Catalysis

Dynamic Magnetization of ε-Fe2O3 in Pulse Field: Evidence of Ssurface Effect Full article

Journal

Journal of Applied Physics
ISSN: 0021-8979 , E-ISSN: 1089-7550

Output data

Year: 2015, Volume: 117, Article number : 063908, Pages count : 6 DOI: 10.1063/1.4907586

Tags

Anisotropy; Magnetic materials; Magnetization; Nanomagnetics; Nanoparticles; Particle size

Authors

Balaev D.A. ^1,2 , Poperechny I.S. ^3,4 , Krasikov A.A. ² , Shaikhutdinov K.A. ¹ , Dubrovskiy A.A. ¹ , Popkov S.I. ¹ , Balaev A.D. ¹ , Yakushkin S.S. ⁵ , Bukhtiyarova G.A. ⁵ , Martyanov O.N. ⁵ , Raikher Yu.L. ^3,6

Affiliations

1	Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russia
2	Siberian Federal University, Krasnoyarsk 660041, Russia
3	Institute of Continuous Media Mechanics, Russian Academy of Sciences, Ural Branch, Perm 614013, Russia
4	Perm National Research Polytechnic University, Perm 614990, Russia
5	Boreskov Institute of Catalysis, Russian Academy of Sciences, Siberian Branch, Novosibirsk 630090, Russia
6	Ural Federal University named after the first President of Russia B.N.Yeltsin

Funding (3)

1	Russian Foundation for Basic Research	12-02-00897 (01201257702)
2	Russian Foundation for Basic Research	14-02-96002 (01201457919)
3	Perm National Research Polytechnic University	MIG S26/617

The magnetization dynamics of ε-Fe2O3 nanoparticles with an average size of about 9 nm is investigated. From comparison of the hysteresis loops obtained in quasi-static conditions and under pulse fields with amplitudes up to 200 kOe and pulse lengths 8–32 ms, it follows that the effective coercivity increases considerably with the variation rate of the imposed magnetic field. A theoretical explanation of this behavior is proposed. The model takes into account the superparamagnetic effects as well as the fact that magnetic anisotropy of the nanoparticles, along with the bulk term, includes a surface contribution. The latter, being of minor importance for the observed magnetic behavior of 25–100 nm particles, becomes essential when the particle size is below 10 nm. From the experimental data, a reference value of the surface anisotropy of nanodisperse ε-Fe2O3 is established, and evidence is presented to the effect that below 300 K this contribution does not significantly depend on temperature.

Balaev D.A. , Poperechny I.S. , Krasikov A.A. , Shaikhutdinov K.A. , Dubrovskiy A.A. , Popkov S.I. , Balaev A.D. , Yakushkin S.S. , Bukhtiyarova G.A. , Martyanov O.N. , Raikher Y.L.
Dynamic Magnetization of ε-Fe2O3 in Pulse Field: Evidence of Ssurface Effect
Journal of Applied Physics. 2015. V.117. 063908 :1-6. DOI: 10.1063/1.4907586 WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	Oct 21, 2014
Accepted:	Jan 25, 2015
Published online:	Feb 12, 2015
Published print:	Feb 14, 2015

Web of science:	WOS:000349846300021
Scopus:	2-s2.0-84923684208
Elibrary:	24010542
Chemical Abstracts:	2014:940342
Chemical Abstracts (print):	161:24442
OpenAlex:	W1986158382

DB	Citing
Web of science	43
Scopus	43
Elibrary	46
OpenAlex	44