Mode Splitting in 37–42 GHz Barium Hexaferrite Resonator: Theory and Device Applications

Author

Popov, M.A. ; Zavislyak, Igor V. ; Movchan, N.N. ; Gudim, Irina A. ; Srinivasan, G.

Author_Institution

Radiophys. Dept., Taras Shevchenko Nat. Univ. of Kyiv, Kiev, Ukraine

Volume

50

Issue

6

fYear

2014

fDate

Jun-14

Firstpage

1

Lastpage

7

Abstract

Dielectric resonances in the 37-42 GHz frequency band in the single crystal barium hexaferrite that occur well below the ferromagnetic resonance (FMR) have been investigated. Sample dimensions have been chosen so that the mode frequency is lower than the spin-wave excitation (in this case, the natural domain resonance) frequency. Such dielectric mode frequencies, being a function of both permittivity and permeability, are magnetic field H tunable. Here, we report on below-FMR magnetodielectric resonance (MDR) axially magnetized barium hexaferrites and their H-tuning characteristics. Our studies reveal H-tuning by up to 2.5 GHz and the tuning is the largest when the ferrite is in a magnetically unsaturated state. A theory for the MDR is presented and a fairly good agreement between experimental data and theory has been obtained. Tunable millimeter wave phase shifters and isolators utilizing the below-FMR dielectric resonances have been demonstrated.

Keywords

barium compounds; dielectric resonance; dielectric resonators; ferromagnetic resonance; magnetic permeability; millimetre wave phase shifters; permeability; permittivity; spin waves; BaFe₆O₁₂; FMR; H-tuning characteristics; axially magnetized barium hexaferrites; barium hexaferrite resonator; device applications; dielectric mode frequencies; ferromagnetic resonance; frequency 37 GHz to 42 GHz; magnetic field; magnetically unsaturated state; magnetodielectric resonance; mode splitting; permeability; permittivity; single crystal barium hexaferrite; spin-wave excitation frequency; tunable millimeter wave phase shifters; Ferrites; Magnetic fields; Magnetic resonance; Perpendicular magnetic anisotropy; Phase shifters; Dielectric resonance; ferromagnetic resonance (FMR); hexagonal ferrite; isolator; phase shifter;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2298498

Filename

6704706