Abstract
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 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.
Highlights
Active manipulation of spin waves is essential for the development of magnon-based technologies
We propose the use of programmable domain walls for active spin-wave manipulation (Fig. 1a)
Using phase-resolved micro-focused Brillouin light scattering (μ-BLS) and micromagnetic simulations, we show that broad domain walls are transparent for spin waves over a wide frequency range
Summary
Active manipulation of spin waves is essential for the development of magnon-based technologies. 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. Active control over spin-wave transport through programmable domain walls could be utilized in magnonic logic devices or non-volatile memory elements. Domain-wall resonances limit the transmission of spin waves at specific frequencies[23,24,25,26] This effect, known as resonant reflection, relates strongly to the spatial inhomogeneity of the effective magnetic field inside the wall. Because of dynamic stray fields and resonance modes, narrow domain walls reflect spin waves more than broad walls. Spin waves are resonantly reflected by narrow domain walls
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