Micromagnetic understanding of the skyrmion Hall angle current dependence in perpendicular magnetized ferromagnets
| Autor: | Aurelio La Corte, Mario Carpentieri, Stefano Chiappini, Anna Giordano, Riccardo Tomasello, Vito Puliafito, Bruno Azzerboni, Zhongming Zeng, Giulio Siracusano, Giovanni Finocchio, Roberto Zivieri, Israa Medlej |
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| Rok vydání: | 2018 |
| Předmět: |
Magnetic skyrmions
skyrmion Hall angle Thiele's equation spin Hall current Thermal fluctuations FOS: Physical sciences 02 engineering and technology skyrmion Hall angle 01 natural sciences NO Thiele's equation 0103 physical sciences Thermal Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Electronic Perpendicular Optical and Magnetic Materials 010306 general physics Electronic Optical and Magnetic Materials Condensed Matter Physics Physics Condensed Matter::Quantum Gases spin Hall current Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Skyrmion Magnetic skyrmions 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Amplitude Ferromagnetism EMPIRICAL MODE DECOMPOSITION ROOM-TEMPERATURE DYNAMICS CREATION TORQUE 0210 nano-technology Realization (systems) Excitation |
| DOI: | 10.48550/arxiv.1808.01476 |
| Popis: | The understanding of the dynamical properties of skyrmions is a fundamental aspect for the realization of a competitive skyrmion based technology beyond complementary metal-oxide semiconductors. Most of the theoretical approaches are based on the approximation of a rigid skyrmion. However, thermal fluctuations can drive a continuous change of the skyrmion size via the excitation of thermal modes. Here, by taking advantage of the Hilbert-Huang transform, we demonstrate that at least two thermal modes can be excited which are nonstationary in time. In addition, one limit of the rigid skyrmion approximation is that this hypothesis does not allow for correctly describing the recent experimental evidence of skyrmion Hall angle dependence on the amplitude of the driving force, which is proportional to the injected current. In this paper, we show that, in an ideal sample, the combined effect of fieldlike and dampinglike torques on a breathing skyrmion can indeed give rise to such a current dependent skyrmion Hall angle. While here we design and control the breathing mode of the skyrmion, our results can be linked to the experiments by considering that the thermal fluctuations and/or disorder can excite the breathing mode. We also develop a generalized Thiele equation and propose an experiment to validate our findings. |
| Databáze: | OpenAIRE |
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