Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session Z21: Magnonics, Spintronic Devices and Imaging Techniques
11:30 AM–2:06 PM,
Friday, March 8, 2024
Room: 101A
Sponsoring
Unit:
GMAG
Chair: Liurukara Sanjeewa, MU Research Reactor
Abstract: Z21.00003 : Complete bandgap for forward volume spin waves in two-dimensional magnonic lattice using YIG and Cu
11:54 AM–12:06 PM
Presenter:
Taichi Goto
(Tohoku University)
Authors:
Taichi Goto
(Tohoku University)
Kanta Mori
(Tohoku University)
Takumi Koguchi
(Tohoku University)
Toshiaki Watanabe
(Shin-Etsu Chemical Co., Ltd)
Mitsuteru Inoue
(Tohoku University)
Kazushi Ishiyama
(Tohoku University)
Our 2D magnonic crystal is composed of a 1 µm thick Cu film, punctuated with hexagonal apertures and slits, settled on a 10-µm-thick YIG film. The holes measure 150 µm in radius, with a lattice constant of 450 µm and slits 1 µm wide. This crystal design is anchored to dual microstrip lines (MSLs). SWs are introduced via one MSL and captured by the second. We analyzed the transmission spectra between these MSLs across a spectrum of SW incident angles on the 2D lattice, spanning 0° to 30°.
The SW transmission bands were computed utilizing the finite integral method. Within these bands, we identified two magnonic bandgaps marked by pronounced transmission decay. Notably, at a frequency of 1.795 GHz, the bandgap's spectral placement remained consistent across all incident angles, underscoring a complete bandgap. Moreover, we varied the hole radius within the structure from 25 µm to 175 µm and recalculated the transmission spectra. Structures with radii between 100 µm and 175 µm exhibited complete bandgaps, with the most pronounced bandgap (0.011 GHz) observed at a 100 µm radius. This discovery is instrumental in steering the development of SW waveguides via 2D magnonic crystals. A comprehensive portrayal of the 2D magnonic crystal structures will be presented at the symposium.
[1] T. Goto et al., Scientific Reports, 9, 16472 (2019).
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