Dielectric properties of Permalloy granular composite materials

✍ Scribed by Teruhiro Kasagi; Takanori Tsutaoka; Kenichi Hatakeyama

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 920 KB
• Volume: 30
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2009.04.011

✦ Synopsis

Dielectric and electrical properties of Permalloy granular composite materials have been studied considering the application to left-handed metamaterials. Surface oxidized Permalloy particles have high surface electrical resistance; the eddy current effect in the composite structure is suppressed. The electrical conductivity of compacted Permalloy particles increases with increasing temperature and indicates the semiconductive layer formation on the particle. The low frequency ac electrical conductivity of Permalloy composite materials shows a drastic increase in the particle content between 50 and 60 vol.%. Electrical permittivity spectra of Permalloy composites show a non-metallic characteristic and the enhancement of permittivity is observed with increase of Permalloy particle content.