Control of spin-wave transmission by a programmable domain wall

Sampo J. Hämäläinen, Marco Madami, Huajun Qin, Gianluca Gubbiotti and Sebastiaan van Dijken ()
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Sampo J. Hämäläinen: NanoSpin, Department of Applied Physics, Aalto University School of Science
Marco Madami: Dipartimento di Fisica e Geologia, Università di Perugia
Huajun Qin: NanoSpin, Department of Applied Physics, Aalto University School of Science
Gianluca Gubbiotti: Istituto Officina dei Materiali del CNR (CNR-IOM), Sede Secondaria di Perugia, c/o Dipartimento di Fisica e Geologia, Università di Perugia
Sebastiaan van Dijken: NanoSpin, Department of Applied Physics, Aalto University School of Science

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-07372-x

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