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MA: Fachverband Magnetismus
MA 2: Ultrafast Magnetization I
MA 2.7: Vortrag
Montag, 16. März 2020, 11:15–11:30, HSZ 101
Anomalous ultrafast optical demagnetization in stripe domain films — •Derang Cao1,2, Roman Adam1, Fangzhou Wang1, Sarah Heidtfeld1, Christian Greb1, and Claus M. Schneider1 — 1Peter Grünberg Institute, Research Centre Jülich, 52425 Jülich, Germany — 2College of Physics, Qingdao University, 266071 Qingdao, China
Recently, laser pump/resonant-X-ray-scattering-probe experiments showed that the regular stripe domain (SD) pattern in CoPd films changes into a labyrinth domain structure after laser pulse excitation [Phys Rev B. 2015;91(5):054416]. This observation leads to an assumption that the films with different SD may exhibit different ultrafast demagnetization response on ultrafast time scales. If this is a case, clarifying the interaction mechanism between the domains and sea of spins on ultrafast time scales may contribute strongly to the understanding the mechanisms of ultrafast spin dynamics.
In this work, a train of 80-fs optical pulses has been used to induce a partial quenching of the magnetization in a wedge Ni80Fe20 film (thickness varying from 25 to 370nm). The magnetization distribution along the wedge direction shows thickness-dependent in-plane or out-of-plane orientation. The magnetization dynamics measurements show substantially faster magnetization recovery of films with SD compared to the homogeneously in-plane magnetized films. We expect that an additional anisotropy introduced in the local region by the SD allows for faster magnetization recovery.