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arXiv · 1506.02303

Experimental observation of the interaction of propagating spin waves with N\'eel domain walls in a Landau domain structure

P. Pirro·T. Koyama·T. Brächer·T. Sebastian·B. Leven·B. Hillebrands
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Abstract

The interaction of propagating dipolar spin waves with magnetic domain walls is investigated in square-shaped microstructures patterned from the Heusler compound Co$_2$Mn$_{0.6}$Fe$_{0.4}$Si. Using magnetic force microscopy, the reversible preparation of a Landau state with four magnetic domains separated by N\'eel domain walls is confirmed. A local spin-wave excitation using a microstructured antenna is realized in one of the domains. It is shown by Brillouin light scattering microscopy (BLS) that the domain structure in the remanence state has a strong influence on the spin-wave excitation and propagation. The domain walls strongly reflect the spin waves and can be used as spin-wave reflectors. A comparison with micromagnetic simulations shows that the strong reflection is due to the long-range dipolar interaction which has important implications for the use of these spin waves for exerting an all-magnonic spin-transfer torque.

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P. Pirro, T. Koyama, T. Brächer, T. Sebastian, B. Leven, B. Hillebrands. 2015-06-07. Experimental observation of the interaction of propagating spin waves with N\'eel domain walls in a Landau domain structure. https://arxiv.org/abs/1506.02303

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