High Frequency Permeability of Thin Film Magnetic Core

K. Nishioka, K. Mitsuoka, M. Aihara, S. Narishige, Y. Sugita

Research output: Contribution to journalArticlepeer-review


The magnetization process of a thin film magnetic core at high frequencies was studied, using a simple magnetic closed circuit with a 17-turn coil. The permeabilities μ, μ ′ and μ ″ were measured. Below 5 MHz, μ and μ ″ increased with the coil current; this increase was inferred to be due to domain wall movement. Above 5 MHz, μ did not increase with the coil current, and it is assumed that domain wall movement does not occur readily above 5 MHz. The magnetic flux density in the core was calculated for frequencies 0.1 MHz~20 MHz, and was found to decrease with the frequency. Because domain walls do not move easily at high frequencies, it is expected that the flux in triangular domains at the edges of the core decreases with increasing frequency.

Original languageEnglish
Pages (from-to)554-560
Number of pages7
JournalIEEE Translation Journal on Magnetics in Japan
Issue number7
Publication statusPublished - 1990 Jul
Externally publishedYes

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Engineering(all)


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