On the Theory of Parametric Excitation of Magnetostatic Modes in Infinite Ferromagnetic Plates by Parallel Pumping

✍ Scribed by H. Dintner; Th. Klupsch

• Publisher: John Wiley and Sons
• Year: 1972
• Tongue: English
• Weight: 575 KB
• Volume: 54
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2220540212

✦ Synopsis

Abstract

Based on the conception of a generalized Polder tensor, the Damon‐Eshbach theory of magnetostatic modes propagating in infinite ferromagnetic plates magnetized parallel to the surfaces is extended including a microwave field parallel to the de field. Restricting to modes obeying the parametric resonance condition, a set of equations determining the mode parameters is derived which exhibit the description of instabilities. The critical microwave field strength h~c~, for setting‐in the instability with respect to the whole system is calculated for X‐band pump frequencies within the volume mode region using YIG material parameters by introducing a phenomenological damping constant. h~c~, plotted over the static field strength (“butterfly curve”) appears as a smooth curve because of a favoured excitation of modes situated within a quasi‐continuous part of the spectrum. The possibility of an excitation of surface modes with high pumping efficiencies is suggested.