Spin-current emission governed by nonlinear spin dynamics
| Autor: | Akiyo Nomura, Kazuya Ando, Shun Watanabe, Keehoon Kang, Saki Matsuura, Henning Sirringhaus, Takaharu Tashiro |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Magnetization dynamics Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics Spintronics Condensed matter physics Magnon FOS: Physical sciences Electron Thermal conduction Article Magnetization Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Spin Hall effect Condensed Matter::Strongly Correlated Electrons Excitation |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/srep15158 |
| Popis: | Coupling between conduction electrons and localized magnetization is responsible for a variety of phenomena in spintronic devices. This coupling enables to generate spin currents from dynamical magnetization. Due to the nonlinearity of magnetization dynamics, the spin-current emission through the dynamical spin-exchange coupling offers a route for nonlinear generation of spin currents. Here, we demonstrate spin-current emission governed by nonlinear magnetization dynamics in a metal/magnetic insulator bilayer. The spin-current emission from the magnetic insulator is probed by the inverse spin Hall effect, which demonstrates nontrivial temperature and excitation power dependences of the voltage generation. The experimental results reveal that nonlinear magnetization dynamics and enhanced spin-current emission due to magnon scatterings are triggered by decreasing temperature. This result illustrates the crucial role of the nonlinear magnon interactions in the spin-current emission driven by dynamical magnetization, or nonequilibrium magnons, from magnetic insulators. |
| Databáze: | OpenAIRE |
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