2026-03-15T02:23:37Z https://hiroshima.repo.nii.ac.jp/oai

oai:hiroshima.repo.nii.ac.jp:02006277 2025-02-21T07:06:31Z 1730444907710

Negative permeability spectra in Permalloy granular composite materials Kasagi, Teruhiro Kasagi Teruhiro Tsutaoka, Takanori Tsutaoka Takanori Hatakeyama, Kenichi Hatakeyama Kenichi open access Copyright (c) 2006 American Institute of Physics. Complex permeability spectra of Permalloy granular composite materials have been studied in the microwave frequency range. The heat-treated Permalloy particles in the air at several hundreds of °C have a high surface electrical resistance; the eddy current effect in the high frequency permeability spectra can be suppressed in the composite structure containing the percolated particles. A negative permeability has been obtained above 5 GHz due to the natural magnetic resonance in the 70 vol % particle content composite material. In this content, electrical permittivity spectra show a nonmetallic characteristic. This permeability dispersion can be applied for the left-handed media. American Institute of Physics 2006-04-25 eng journal article VoR https://hiroshima.repo.nii.ac.jp/records/2006277 10.1063/1.2198113 http://dx.doi.org/10.1063/1.2198113 0003-6951 AA00543431 Applied Physics Letters Applied Physics Letters 88 17 172502-1 172502-1 172502-3 https://hiroshima.repo.nii.ac.jp/record/2006277/files/ApplPhysLett_88_172502.pdf 162.8 KB