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Study of microwave absorptions in M-hexaferrites for anti-radar applications*

Published online by Cambridge University Press:  15 September 1999

O. Dubrunfaut ,
S. Zouhdi ,
A. Fourrier-Lamer ,
E. Brando  and
H. Vincent
O. Dubrunfaut*
Affiliation:
LDIM EA 253/DSPT4/MENRT, Paris VI, 4 place Jussieu, 75252 Paris Cedex 05, France
S. Zouhdi
Affiliation:
LDIM EA 253/DSPT4/MENRT, Paris VI, 4 place Jussieu, 75252 Paris Cedex 05, France
A. Fourrier-Lamer
Affiliation:
LDIM EA 253/DSPT4/MENRT, Paris VI, 4 place Jussieu, 75252 Paris Cedex 05, France
E. Brando
Affiliation:
LMGP (URA 1109 du CNRS), ENS de Physique de Grenoble, 38402 St Martin-d'Hères Cedex, France
H. Vincent
Affiliation:
LMGP (URA 1109 du CNRS), ENS de Physique de Grenoble, 38402 St Martin-d'Hères Cedex, France
*
[email protected]
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Abstract

Microwave absorption of sintered M-type hexaferrites (BaFe12−2x Rux Znx O19) is investigated as a function of the substitution ratio x. The substitution with Ru and Zn has been shown to reduce the axial anisotropy of the BaM-hexaferrite which becomes in-plane for x ≈ 0.4. Large saturation magnetization and in-plane magnetic anisotropy allow to obtain high permeability values at microwave frequencies. To study the behavior of the ferrites at these frequencies, the complex constitutive parameters ε and μ (respectively permittivity and permeability) are simultaneously measured from 0.5 up to 18 GHz using a coaxial technique. Two absorption phenomena are observed: the ferrimagnetic resonance and the domain wall relaxation; the latter is studied with the Globus' model. Anti-radar applications are also mentioned.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 8 , Issue 2 , September 1999 , pp. 159 - 162
Copyright
© EDP Sciences, 1999

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Footnotes

*

This paper was presented at “Journées Oxydes Magnétiques” heldat Dijon the March 24–26, 1998.

References

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