Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 34: Spin Dynamics and Transport: Magnonics

MA 34.11: Vortrag

Mittwoch, 22. März 2017, 12:15–12:30, HSZ 04

Domain configuration mediated spinwave superpositions — •Rasmus B. Holländer, Cai Müller, Mathis Lohmann, and Jeffrey McCord — Institute for Materials Science, Kiel University, Kaiserstraße 2, 24143 Kiel, Germany

Spin waves can be generated in close proximity to domain walls [1] or at vortex core centers [2]. Here, we employ time-resolved magneto-optical wide-field imaging in an enhanced concept to directly monitor the local magnetization vector response to an external stimulus in the time domain. Variation of the azimuthal angle of incidence of the probing light yields differential magnetic vector information of the integral signal, allowing for separation of polar and pure in-plane Kerr components. A ferromagnetic resonance geometry utilizing the quasi-homogeneous Oersted-field on top of a coplanar waveguide is used as an excitation scheme. The magneto-dynamic response of an amorphous CoFeB stripe element is investigated in several magnetic domain configurations exhibiting asymetric Bloch walls. The data obtained from different sensitivity directions indicate superpositions of spin waves with wavefronts parallel to the domain walls in a configuration similar to the Damon-Eshbach mode.

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

[1] B. Mozooni and J. McCord, APL 107, 042402 (2015)

[2] S. Wintz et al., Nature Nanotech. 11, 948 (2016)