Control of spin-wave transmission by a programmable domain wall

Sampo J. Hämäläinen, Marco Madami, Huajun Qin, Gianluca Gubbiotti, Sebastiaan van Dijken
2018 Nature Communications  
Active manipulation of spin waves is essential for the development of magnon-based technologies. Here, we demonstrate programmable spin-wave filtering by resetting the spin structure of pinned 90°Néel domain walls in a continuous CoFeB film with abrupt rotations of uniaxial magnetic anisotropy. Using micro-focused Brillouin light scattering and micromagnetic simulations, we show that broad 90°head-to-head or tail-to-tail magnetic domain walls are transparent to spin waves over a broad frequency
more » ... range. In contrast, magnetic switching to a 90°head-to-tail configuration produces much narrower and strongly reflecting domain walls at the same pinning locations. Based on these results, we propose a magnetic spin-wave valve with two parallel domain walls. Switching the spin-wave valve from an open to a closed state changes the transmission of spin waves from nearly 100 to 0%. Active control over spin-wave transport through programmable domain walls could be utilized in magnonic logic devices or non-volatile memory elements.
doi:10.1038/s41467-018-07372-x fatcat:7appu2oryncg7l6hs37skl6k4m