Magnetic Permeability Time-varying Metamaterials at Microwave Frequencies
Abstract
We demonstrate magnetic permeability time-varying metamaterials at GHz frequencies using ferromagnetic permalloy (Ni80Fe20; Py). We observe frequency up and down conversion of 4 GHz microwaves through the metamaterials, which is caused by the temporal modulation of permeability in the Py layer. Moreover, the efficiency of the up-conversion to a higher frequency is much larger than that of the down conversion to a lower frequency. These experimental results are reproduced well via numerical calculation, verifying that the significant up-conversion efficiency is traced back to nonlinear magnetization dynamics in the metamaterials. The present study opens a door to microwave sources toward the 6th-generation mobile communication system, four-dimensional metamaterials with spatio-temporal modulation, and nonlinear spintronics.
Keywords
Cite
@article{arxiv.2503.04571,
title = {Magnetic Permeability Time-varying Metamaterials at Microwave Frequencies},
author = {Toshiyuki Kodama and Nobuaki Kikuchi and Takahiro Chiba and Seigo Ohno and Satoshi Okamoto and Satoshi Tomita},
journal= {arXiv preprint arXiv:2503.04571},
year = {2025}
}
Comments
7 pages, 4 figures