Dynamic Remagnetisation of CoFe2O4 Nanoparticles:Thermal Fluctuational Thawing of Anisotropy | Sciact - CRIS-system of Boreskov Institute of Catalysis

Dynamic Remagnetisation of CoFe2O4 Nanoparticles:Thermal Fluctuational Thawing of Anisotropy Full article

Journal

Journal of Physics D: Applied Physics
ISSN: 0022-3727 , E-ISSN: 1361-6463

Output data

Year: 2021, Volume: 54, Number: 27, Article number : 275003, Pages count : 11 DOI: 10.1088/1361-6463/abf371

Tags

cobalt ferrite; effective anisotropy; magnetodynamics; nanoparticles; superparamagnetism

Authors

Balaev D A ¹ , Poperechny I S ^2,3 , Krasikov A A ¹ , Semenov S V ¹ , Popkov S I ¹ , Knyazev Y V ¹ , Kirillov V L ⁴ , Yakushkin S S ⁴ , Martyanov O N ⁴ , Raikher Yu L ²

Affiliations

1	Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660000, Russia
2	Institute of Continuous Media Mechanics, Russian Academy of Sciences, Ural Branch, Perm 614068, Russia
3	Department of Phase Transitions Physics, Perm State National Research University, Perm 614990, Russia
4	Boreskov Institute of Catalysis, Russian Academy of Sciences, Siberian Branch, Novosibirsk 630090, Russia

Funding (2)

1	The Ministry of Education and Science of the Russian Federation	0356-2016-0403 (АААА-А17-117103050081-1)
2	Ministry of Science and Higher Education of the Russian Federation	075-00553-19-00 (АААА-А20-120020690030-5)

We report a study of the magnetodynamics of cobalt ferrite (CoFe2O4) nanoparticles with an average diameter of ~6 nm. Hysteresis loops were measured under quasi-static conditions and in pulse fields with amplitudes H0 of up to 130 kOe and for durations τP of 8 and 16 ms. The growth of coercivity Hc observed with an increase in the magnetic field variation rate dH/dt (determined by the values of H0 and τP) and the reduction of Hc with temperature is ascribed to the superparamagnetic effect. The proposed theoretical model explains the observed dependences fairly well. Notably, the effective magnetic anisotropy constant obtained exceeds the value for bulk crystals and might be indicative of the contribution of surface magnetic anisotropy.

Balaev D.A. , Poperechny I.S. , Krasikov A.A. , Semenov S.V. , Popkov S.I. , Knyazev Y.V. , Kirillov V.L. , Yakushkin S.S. , Martyanov O.N. , Raikher Y.L.
Dynamic Remagnetisation of CoFe2O4 Nanoparticles:Thermal Fluctuational Thawing of Anisotropy
Journal of Physics D: Applied Physics. 2021. V.54. N27. 275003 :1-11. DOI: 10.1088/1361-6463/abf371 WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	Dec 16, 2020
Accepted:	Mar 30, 2021
Published online:	Apr 23, 2021
Published print:	Jul 8, 2021

Web of science:	WOS:000644173000001
Scopus:	2-s2.0-85105388499
Elibrary:	46045550
Chemical Abstracts:	2021:1693715
Chemical Abstracts (print):	176:41791
OpenAlex:	W3147981030

DB	Citing
Web of science	10
Scopus	10
Elibrary	15
OpenAlex	14