Magnonic Spectra of Ferromagnetic Composites Versus Magnetization Contrast

• Authors: M. Krawczyk , H. Puszkarski
• Languages of publication: EN

Abstracts

EN

It had been shown recently that the calculated magnonic spectra of two-dimensional periodic ferromagnetic composites can present frequency ranges forbidden for the propagation of magnon excitations throughout the composite. However, those forbidden energy gaps were found to be highly sensitive to the exchange contrast between the component ferromagnetic materials but were very weakly sensitive to the contrast in spontaneous magnetizations of the two materials. Accordingly, in this paper we introduce a new mathematical definition of the exchange field acting in inhomogeneous medium. With this new definition the present theory gives magnonic spectra reasonably sensitive to magnetization contrast, as they should be from the physical viewpoint; moreover, the magnetization contrast now becomes a gap-creating factor as well.

Keywords

EN

75.50.Gg

Discipline

• 75.50.Gg: Ferrimagnetics

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1998
• Volume: 93
• Issue: 5-6
• Pages: 805-810

Dates

published

1998-05

received

1998-03-27

Contributors

author

M. Krawczyk

• Surface Physics Division, Institute of Physics, A. Mickiewicz University, Umultowska 85, 60-614 Poznań, Poland

author

H. Puszkarski

• Surface Physics Division, Institute of Physics, A. Mickiewicz University, Umultowska 85, 60-614 Poznań, Poland

Identifiers

DOI

10.12693/APhysPolA.93.805