Eur. Phys. J. AP
Volume 8, Number 2, September 1999
|Page(s)||159 - 162|
|Published online||15 September 1999|
Study of microwave absorptions in M-hexaferrites for anti-radar applications*
LDIM EA 253/DSPT4/MENRT, Paris VI, 4 place Jussieu, 75252 Paris Cedex 05, France
2 LMGP (URA 1109 du CNRS), ENS de Physique de Grenoble, 38402 St Martin-d'Hères Cedex, France
Corresponding author: firstname.lastname@example.org
Revised: 21 September 1999
Accepted: 21 September 1999
Published online: 15 September 1999
Microwave absorption of sintered M-type hexaferrites (BaFe12−2xRuxZnxO19) 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.
PACS: 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 76.50.+g – Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
© EDP Sciences, 1999
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