Dynamics of current induced magnetic superstructures in exchange-spring devices

• Опубліковано в: Физика низких температур
• Дата: 2012
• ISSN: 0132-6414
• Автори: Kadigrobov, A.M., Shekhter, R.I., Jonson, M.
• Формат: Стаття
• Мова: Англійська
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2012
• Теми: Магнетизм
• Онлайн доступ: https://nasplib.isofts.kiev.ua/handle/123456789/117264
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Dynamics of current induced magnetic superstructures
 in exchange-spring devices / A.M. Kadigrobov, R.I. Shekhter, M. Jonson // Физика низких температур. — 2012. — Т. 38, № 7. — С. 793-800. — Бібліогр.: 32 назв. — англ.

Thermoelectric manipulation of the magnetization of a magnetic layered stack in which a low-Curie temperature
 magnet is sandwiched between two strong magnets (exchange spring device) is considered. Controllable
 Joule heating produced by a current flowing in the plane of the magnetic stack (CIP configuration) induces
 a spatial magnetic and thermal structure along the current flow — a magnetothermal-electric domain (soliton).
 We show that such a structure can experience oscillatory in time dynamics if the magnetic stack is incorporated
 into an electric circuit in series with an inductor. The excitation of these magnetothermionic oscillations follow
 the scenario either of “soft” of “hard” instability: in the latter case oscillations arise if the initial perturbation is
 large enough. The frequency of the temporal oscillations is of the order of 10⁵–10⁷
 s⁻¹ for current densities
 j ~ 10⁶
 –10⁷
 A/cm²
 .