A micro-structured ion-implanted magnonic crystal
Bj\"orn Obry (1), Philipp Pirro (1), Thomas Br\"acher (1, 2),, Andrii V. Chumak (1), Julia Osten (3), Florin Ciubotaru (1), Alexander A., Serga (1), J\"urgen Fassbender (3), Burkard Hillebrands (1) ((1), Fachbereich Physik, Forschungszentrum OPTIMAS, Technische Universit\"at
TL;DR
This paper demonstrates that localized ion implantation can create effective magnonic crystals by inducing periodic variations in magnetization, significantly controlling spin-wave propagation for potential spintronic devices.
Contribution
It introduces a novel fabrication method for magnonic crystals using localized ion implantation to modulate saturation magnetization periodically.
Findings
Ion implantation causes a 7% change in saturation magnetization.
Spin-wave transmission is reduced by a factor of 10 in band gaps.
Periodic magnetization variation creates frequency band gaps.
Abstract
We investigate spin-wave propagation in a microstructured magnonic-crystal waveguide fabricated by localized ion implantation. The irradiation caused a periodic variation in the saturation magnetization along the waveguide. As a consequence, the spin-wave transmission spectrum exhibits a set of frequency bands, where spin-wave propagation is suppressed. A weak modification of the saturation magnetization by 7% is sufficient to decrease the spin-wave transmission in the band gaps by a factor of 10. These results evidence the applicability of localized ion implantation for the fabrication of efficient micron- and nano-sized magnonic crystals for magnon spintronic applications.
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