Magnetocaloric Properties of Cylindrical Nickel and Iron Nanowires Containing a Cross Domain Wall
A. B. Shevchenko
Институт металлофизики им. Г. В. Курдюмова НАН Украины, бульв. Академика Вернадского, 36, 03142 Киев, Украина
Получена: 25.05.2024; окончательный вариант - 06.07.2024. Скачать: PDF
The magnetocaloric effect (MKE) in cylindrical ferromagnetic nanowires (FN), the magnetic structure of which is characterized by a local spacing region with a Néel’s type of transformation of magnetization vector $\textbf{M}$—a cross domain wall (DW), is reviewed. For nickel and iron nanowires, it is shown that the influence of the thermal motion of DW in a weak magnetic field smaller significantly than 2$\pi$$M$ causes a negative MKE. In the absence of DW, there is a positive MKE in wires. Estimates show that it is possible by means of a negative MKE to reduce (or to increase with the reverse change of the magnetic field) the temperature of a compact comprised of 10$^{3}$–10$^{4}$ nickel (iron) nanowires by 1 K. The results presented in review are of practical importance in the context of the development of state-of-the-art technologies, which are based on the magnetocaloric properties of cylindrical FN with а cross DW.
Ключевые слова: cylindrical ferromagnetic nanowire, cross domain wall, magnetic field, magnetocaloric effect, entropy.
URL: https://mfint.imp.kiev.ua/ru/abstract/v46/i07/0621.html
PACS: 65.80.-g, 75.30.Sg, 75.45.+j, 75.50.Bb, 75.50.Cc, 75.60.Ch, 75.75.Fk