| Autor: |
Shalagatskyi, V., Kovalenko, O., Shumylo, V., Alekhin, A., Vaudel, G., Pezeril, T., Vlasov, V. S., Lomonosov, A. M., Gusev, V. E., Makarov, D., Temnov, V. V. |
| Rok vydání: |
2015 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| Popis: |
Ultrafast optical excitation of gold-cobalt bilayers triggers the nontrivial interplay between the electronic, acoustic, and magnetic degrees of freedom. Laser-heated electrons generated at the gold-air interface diffuse through the layer of gold and strongly overheat the lattice in cobalt resulting in the emission of ultrashort acoustic pulses and generation of exchange-coupled magnons. Time-resolved optical measurements allow for extracting the thermal boundary (Kapitza) resistances at metal/metal interfaces and the hot electron diffusion length in ferromagnetic materials. Both the experimental data and the analytical treatment of the two-temperature model reveal the role of the Kapitza resistance in transient lattice overheating. |
| Databáze: |
arXiv |
| Externí odkaz: |
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