Title :
Complex permeability of polycrystalline hexagonal ferrites
Author :
Nakamura, Tatsuya ; Hatakeyama, Ken-ichi
Author_Institution :
R&D Div., Toda Kogyo Corp., Otake, Japan
fDate :
9/1/2000 12:00:00 AM
Abstract :
Polycrystalline hexagonal ferrites (Y, Z and W-phases) were prepared by the usual ceramic sintering. Their complex permeability spectra were natural resonance type, and numerically separated into spin rotational and domain wall motion components. For the spin rotational component, it was found that the Snoek´s product values of them were far beyond the product values of spinel ferrite. It enabled us to design thin electromagnetic wave absorbers for the quasimicrowave region
Keywords :
Snoek effect; barium compounds; cobalt compounds; electromagnetic wave absorption; ferrites; magnetic domain walls; magnetic permeability; nickel compounds; sintering; zinc compounds; Ba(CoZn)2Fe15O27; Ba2(NiZn)2Fe12O22; Ba3(CoZn)2Fe24O41; Snoek´s product; ceramic sintering; complex permeability spectra; domain wall motion; polycrystalline hexagonal ferrites; quasimicrowave region; spin rotation; thin electromagnetic wave absorbers; Ceramics; Electromagnetic scattering; Ferrites; Iron; Magnetic resonance imaging; Milling; Permeability; Powders; Radio frequency; Zinc;
Journal_Title :
Magnetics, IEEE Transactions on
