Femtosecond resonant magneto-optical Kerr effect measurement on an ultrathin magnetic film in a soft X-ray free electron laser


Femtosecond resonant magneto-optical Kerr effect measurement on an ultrathin magnetic film in a soft X-ray free electron laser

Yamamoto, S.; Kubota, Y.; Yamamoto, K.; Takahashi, Y.; Maruyama, K.; Suzuki, Y.; Hobara, R.; Fujisawa, M.; Oshima, D.; Owada, S.; Togashi, T.; Tono, K.; Yabashi, M.; Hirata, Y.; Yamamoto, S.; Kotsugi, M.; Wadati, H.; Kato, T.; Iwata, S.; Shin, S.; Matsuda, I.

Time-resolved magneto-optical Kerr effect (MOKE) measurement was demonstrated on a sample of the Au/Fe/Au heterostructure with the Fe layer of 0.35nm thickness under Fe M-edge resonance condition. An ultrabrilliant free electron laser (FEL) in the soft X-ray range was facilitated for the detection of transient signals of resonant MOKE from the ultrathin Fe film. A variation in the Kerr rotation angle was successfully observed on the femtosecond timescale. This technique enables us to reveal the transient magnetization dynamics of such a-few-monolayer magnetic films, which promote the development of spintronic devices.

Permalink: https://www.hzdr.de/publications/Publ-28452
Publ.-Id: 28452