Wave-vector-dependent spin pumping as a probe of exchange-coupled magnons
| Autor: | Kazuya Ando, Yuma Tateno, Koji Sekiguchi, Masaya Fukami |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Spin pumping Bistability Condensed matter physics Magnon Non-equilibrium thermodynamics Heterojunction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Excited state 0103 physical sciences Wavenumber Condensed Matter::Strongly Correlated Electrons Wave vector 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 93 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.93.184429 |
| Popis: | We demonstrate that short-wavelength exchange-coupled magnons can be identified electrically through the combination of their spin-pumping and damping properties in a metal/magnetic insulator heterostructure. We present clear wave-vector dependence of the spin pumping from parametrically excited exchange-coupled magnons in the heterostructure. The efficiency of spin pumping by dipole-exchange magnons was measured to be sensitive to their wave numbers and propagation angles, while the efficiency was found to be almost constant in the exchange limit. This dependence enabled us to uncover nontrivial dual bistability in the system originating from drastic change in dominant nonequilibrium magnon modes. These findings pave a path for direct electric access to short-wavelength spin dynamics that cannot be probed by optical techniques. |
| Databáze: | OpenAIRE |
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