Vortex-antivortex dynamics driven by spin-torque in a nanocontact

• Опубліковано в: : Физика низких температур
• Дата: 2015
• Автори: Zaspel, C.E., Kireev, V.E.
• Формат: Стаття
• Мова: Англійська
• Опубліковано: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2015
• Теми: Специальный выпуск К 80-летию уравнения Ландау–Лифшица
• Онлайн доступ: https://nasplib.isofts.kiev.ua/handle/123456789/128083
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Vortex-antivortex dynamics driven by spin-torque in a nanocontact / C.E. Zaspel, V.E. Kireev // Физика низких температур. — 2015. — Т. 41, № 10. — С. 1001–1008. — Бібліогр.: 30 назв. — англ.

A spin-polarized current in a nanocontact has been shown to induce the formation of a magnetic vortex
 at the nanocontact by the Oersted field, and spin-torque drives the vortex core in an elliptical orbit about
 the nanocontact. For the case of an external in-plane magnetic field in an extended free layer, the magnetization
 will be uniform far from the nanocontact, implying that vortex formation must be accompanied by the formation
 of an antivortex. Using the Thiele approach to describe the vortex-antivortex dynamics it is shown that the frequency
 of gyrotropic motion of the vortex is a function of the nanocontact current which is linear for large vortex-antivortex
 separations and it becomes nonlinear as the separation is decreased. The equilibrium vortexantivortex
 separation can be controlled by the nanocontact current as well as the external magnetic field.