Intrinsic low-field loss in microwave ferrites

Author

Schloemann, Ernst F.

Author_Institution

38 Brook Rd., Weston, MA, USA

Volume

34

Issue

6

fYear

1998

fDate

11/1/1998 12:00:00 AM

Firstpage

3830

Lastpage

3836

Abstract

The off-resonance damping parameter due to the three-magnon splitting process is calculated by extending the theory of intrinsic magnetic relaxation processes. The imaginary part of the diagonal component of the microwave permeability tensor is found to decrease with increasing internal magnetic field and to be proportional to the absolute temperature. In magnitude it is somewhat smaller than the subthreshold absorption under parallel pumping, which has a similar physical origin and has previously been calculated and verified by experiments. Since the calculated magnetic damping occurs in all magnetic materials, it is expected to contribute significantly to the insertion loss of many ferrite microwave devices

Keywords

damping; ferrite devices; ferrites; ferromagnetic resonance; losses; magnetic microwave devices; magnetic permeability; magnetic relaxation; magnons; FMR; damping parameter; ferrite microwave device; insertion loss; internal magnetic field; intrinsic low field loss; magnetic material; magnetic relaxation; microwave ferrite; microwave permeability tensor; parallel pumping; subthreshold absorption; three-magnon splitting; Damping; Electromagnetic wave absorption; Ferrites; Insertion loss; Magnetic devices; Magnetic fields; Magnetic materials; Permeability; Temperature; Tensile stress;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.728291

Filename

728291