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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Kim, D. Ohnishi, M. Matsushita, N. Abe, M. |
| Copyright Year | 1965 |
| Abstract | Permalloy (Ni/sub 47/Fe/sub 53/) microspheres of 4 and 8 /spl mu/m in average diameter were encapsulated with Ni-Zn ferrite by ultrasound enhanced ferrite plating from an aqueous solution at 80/spl deg/C at pH=6-9. The ferrite-encapsulated microspheres were compacted to toroidal cores, on which complex permeability (/spl mu/=/spl mu/'-j/spl mu/'') was measured. The natural ferromagnetic resonance frequency f/sub r/ (criterion for usable frequency), and /spl mu/' of the cores exceeded Snoek's limit for Ni-Zn ferrite bulk by one order of magnitude. The cores exhibited one-turn-coil impedance exceeding 40 /spl Omega/ at 1-3 GHz, suggesting that they will be applied to gigahertz electromagnetic compatibility bead inductors to suppress electromagnetic noises. In addition, the cores will be applied to low-loss inductors operated at tens of megahertz, since they have Q=/spl mu/'//spl mu/''>100 up to 45 MHz when the microspheres were plated at pH=6. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 3181 |
| Ending Page | 3183 |
| Page Count | 3 |
| File Size | 343491 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 39 |
| Issue Number | 5 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2003-09-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Magnetic cores Ferrites Electromagnetic compatibility Inductors Iron Ultrasonic imaging Permeability measurement Ultrasonic variables measurement Magnetic resonance Resonant frequency |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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