Dynamic Remagnetisation of CoFe2O4 Nanoparticles:Thermal Fluctuational Thawing of Anisotropy
Научная публикация
| Общая информация |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Journal of Physics D: Applied Physics
ISSN: 0022-3727
, E-ISSN: 1361-6463
|
| Вых. Данные |
Год: 2021,
Том: 54,
Номер: 27,
Номер статьи
: 275003,
Страниц
: 11
DOI:
10.1088/1361-6463/abf371
|
| Ключевые слова |
cobalt ferrite; effective anisotropy; magnetodynamics; nanoparticles; superparamagnetism |
| Авторы |
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
|
| Организации |
| 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
|
|
Информация о финансировании (2)
|
1
|
Министерство образования и науки Российской Федерации
|
0356-2016-0403 (АААА-А17-117103050081-1)
|
|
2
|
Министерство науки и высшего образования Российской Федерации
|
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.