Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Magnonics I

MA 31.4: Vortrag

Mittwoch, 14. März 2018, 16:00–16:15, H 0110

Broadband Magnetoelastic and Magnetostatic Spin Wave Emission by Magnetic Domain Walls — •Rasmus Holländer, Cai Müller, and Jeffrey McCord — Institute for Materials Science, Kiel University, Kaiserstraße 2, 24143 Kiel, Germany

We investigate the linear dynamic magnetization response of an amorphous CoFeB stripe element in different domain states by homogeneous Oersted-field excitation. Coherent spin waves emitted by the domain walls can be directly observed by component-selective time-resolved magneto-optical wide-field imaging. The system is modeled in a two dimensional micromagnetic model. Magnetoelastic and magnetostatic spin waves can be distinguished by their dispersion and relation to magnetization orientation and domain wall orientation. The emission of spin waves from excited micromagnetic objects is a general physical phenomenon relevant for magnetization dynamics in patterned magnetic thin films.

The authors thank the German Science Foundation (DFG) for the financial support (grant Mc9/9-2 and Mc9/10-2).