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| Hauptverfasser: | , , , , , |
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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2503.04571 |
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| _version_ | 1866915199662948352 |
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| author | Kodama, Toshiyuki Kikuchi, Nobuaki Chiba, Takahiro Ohno, Seigo Okamoto, Satoshi Tomita, Satoshi |
| author_facet | Kodama, Toshiyuki Kikuchi, Nobuaki Chiba, Takahiro Ohno, Seigo Okamoto, Satoshi Tomita, Satoshi |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_04571 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnetic Permeability Time-varying Metamaterials at Microwave Frequencies Kodama, Toshiyuki Kikuchi, Nobuaki Chiba, Takahiro Ohno, Seigo Okamoto, Satoshi Tomita, Satoshi Optics Materials Science 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. |
| title | Magnetic Permeability Time-varying Metamaterials at Microwave Frequencies |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2503.04571 |