Magnetic domain-dependent ultrafast optical demagnetization in stripe domain films
| Autor: | Xiaowen Chen, Roman Adam, Fangzhou Wang, Yawen Song, Lining Pan, Chengkun Song, Sarah Heidtfeld, Christian Greb, Qiuyue Li, Jing Yu, Jing Zhang, Yuanzhi Cui, Shandong Li, Jie Xu, Mirko Cinchetti, Claus M Schneider, Derang Cao |
|---|---|
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Journal of Physics D: Applied Physics. 56:285001 |
| ISSN: | 1361-6463 0022-3727 |
| DOI: | 10.1088/1361-6463/accd7d |
| Popis: | We investigated femto- and picosecond-time magnetization dynamics in a ferromagnetic Ni80Fe20 film with varying thicknesses (wedge-shaped film). We observed that the thickness gradient strongly affects the magnetic moment distribution, causing a magnetization reorientation from in-plane to out-of-plane, and formatting a stripe domain (SD) at the thicker end of the wedge. The magnetization dynamics measurements reveal that the part of the film displaying SDs follows a substantially faster demagnetization and magnetization recovery and smaller magnetization quenching compared to the in-plane domain film. The experiments and micromagnetic simulations support that the decrease in relaxation time is caused by a magnetic anisotropy of the films introduced by SD formation. Our results point out that the micromagnetic structure plays an important role in the magnetization dynamics in ferromagnetic films after optically triggered demagnetization. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|