Transient dynamics of strongly coupled spin vortex pairs: Effects of anharmonicity and resonant excitation on inertial switching

Abstract

Spin vortices in magnetic nanopillars are used as GHz oscillators, with frequency however essentially fixed in fabrication. We demonstrate a model system of a two-vortex nanopillar, in which the resonance frequency can be changed by an order of magnitude, without using high dc magnetic fields. The effect is due to switching between the two stable states of the vortex pair, which we show can be done with low-amplitude fields of sub-ns duration. We detail the relevant vortex-core dynamics and explain how field anharmonicity and phase control can be used to enhance the performance.

Dirac's Spectrum from Newton’s Laws in Graphene

“…The excitation time obtained here, for the electron-hole mass-vortex at , is of the order of the decoupling time of the vertically-stacked pair of spin-vortices with core-core bound states, predicted theoretically in previous studies [52,53] and observed experimentally in a recent study [54]. Another physical observation concerns the construction of the electron band mass-vortex presented in Figures 1 and 7.…”

Совместное Влияние Магнитного Поля И Спин-Поляризованного Тока На Переключение Полярности Магнитных Вихрей В Спин-Трансферном Наноосцилляторе

“…Свойства вихревого СТНО, когда магнитный вихрь существует в каждом из магнитных слоев [8][9][10][11][12][13][14], в значительной степени зависят от полярности вихрей. Теоретически показано, что с помощью спин-поляризованного тока можно возбудить гиротропные колебания магнитостатически связанных вихрей с постоянной частотой, которая может меняться при приложении магнитного поля [12,13].…”

Joint Effect of a Magnetic Field and a Spin-Polarized Current on Polarity Switching of Magnetic Vortices in a Spin-Transfer Nanooscillator

“…The properties of a vortex STNO, when the magnetic vortex exists in each of the magnetic layers [8][9][10][11][12][13][14], largely depend on the polarity of the vortices. It is theoretically shown that with the help of a spin-polarized current it is possible to excite gyrotropic oscillations of magnetostatically coupled vortices with a constant frequency, which can change when the magnetic field is applied [12,13].…”