| Autor: |
Ramasubramanian, L., Iurchuk, V., Hellwig, O., Deac, A. M. |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
arXiv:2209.03701 [cond-mat.mes-hall]: https://arxiv.org/abs/2209.03701 |
| Popis: |
We present a frequency-domain study of the dynamic behavior of a magnetic vortex core within a single Permalloy disk by means of electrical detection and micromagnetic simulations. When exciting the vortex core dynamics in a non-linear regime, the lineshape of the rectified dc signal reveals a resonance peak splitting \textcolor{blue}{which depends on the excitation amplitude.} Using micromagnetic simulations, we show that at high excitation power the peak splitting originates from the nanosecond time scale quasi-periodic switching of the vortex core polarity. \textcolor{blue}{Using lock-in detection, the rectified voltage is} integrated over a ms time scale, so that the net signal detected between the two resonant peaks for a given range of parameters cancels out. The results are in agreement with the reported effects of the in-plane static field magnitude on the gyration dynamics, and complement them by detailed analysis of the effects of the rf current amplitude and the azimuthal angle of the in-plane bias magnetic field. Systematic characterization shows that a transition from linear to nonlinear dynamical regime can be controlled \textcolor{blue}{by rf current as well as by} varying the magnitude and the direction of the bias magnetic field. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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