Magnetic permeability time-varying metamaterials at microwave frequencies

Optical Materials Express 2026 Open access

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Authors: Toshiyuki Kodama, Nobuaki Kikuchi, Takahiro Chiba, Seigo Ohno, Satoshi Okamoto, Satoshi Tomita
DOI: 10.1364/ome.601242
Cited by: 0

Abstract

We demonstrate magnetic permeability ( μ ) time-varying metamaterials at GHz frequencies using ferromagnetic permalloy (Ni 80 Fe 20 ; Py). A 4 GHz microwave is up- and down-converted in frequency through the metamaterials. At higher modulation frequencies, the up-conversion efficiency is much larger than the down-conversion efficiency. These experimental results are reproduced via numerical simulation, verifying that the significant up-conversion efficiency is traced back to nonlinear magnetization dynamics due to demagnetization in the Py film. The present study opens a door to nonlinear spintronics and magnonics, and metamaterials with spatio-temporal modulation.

Fields of Study & Subjects

Metamaterials and Metasurfaces Applications Advanced Wireless Communication Technologies Electromagnetic wave absorption materials

Publication details

Journal / source
Optical Materials Express
Volume
16
Issue
9
Pages
2875–2875
Publication date
24 July 2026
Language
EN