Control of spin-wave transmission by a programmable domain wall

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.

DOI

10.1038/s41467-018-07372-x

Citation

Hämäläinen, S J, Madami, M, Qin, H, Gubbiotti, G & van Dijken, S 2018, 'Control of spin-wave transmission by a programmable domain wall', Nature Communications, vol. 9, no. 1, pp. 1-8. https://doi.org/10.1038/s41467-018-07372-x

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https://urn.fi/URN:NBN:fi:aalto-201812106257

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[article-cris] Perustieteiden korkeakoulu / SCI

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Control of spin-wave transmission by a programmable domain wall

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