Microwave absorption in Sc- and CoTi-substituted Ba hexaferrite powders

Author

Nedkov, I. ; Petkov, A. ; Karpov, V.

Author_Institution

Inst. of Electron., Bulgarian Acad. of Sci., Sofia, Bulgaria

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

1483

Lastpage

1484

Abstract

Investigations of hexagonal ferrites as a gyromagnetic medium allow the analysis of phenomena related to ferromagnetic resonance (FMR) in ferrites with high internal anisotropy. In the present work, (Sc)- and (CoTi)-substituted M-type hexaferrite powders are examined on the basis of the general formula BaM_xFe_12-xO ₁₀, where M=(Sc) and (CoTi), while x=0-1.8. Some relationships are established concerning the influence of the particle size, orientation, and chemical composition on microwave absorption in a wide frequency range (5-70 GHz). It is concluded that replacing some of the Fe³⁺ ions in a Ba hexaferrite with (Sc) and (CoTi) opens up the possibility of controlling the microwave operating frequency of these materials by varying the degree of substitution. The results obtained suggest the predominant influence of the size and geometry of highly anisotropic gyromagnetic particles on the degree of microwave absorption in the region of natural FMR

Keywords

barium compounds; ferrites; ferromagnetic resonance; particle size; powders; 5 to 70 GHz; Ba(CoTi)_xFe_12-xO₁₉; BaSc_xFe_12-xO₁₉; FMR; Fe³⁺ ions; chemical composition; ferromagnetic resonance; gyromagnetic medium; gyromagnetic particles; hexaferrite powders; hexagonal ferrites; high internal anisotropy; microwave absorption; microwave operating frequency; orientation; particle size; Anisotropic magnetoresistance; Chemicals; Electromagnetic wave absorption; Ferrites; Frequency; Geometry; Gyromagnetism; Iron; Magnetic resonance; Powders;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104419

Filename

104419