Measurements of the exchange stiffness of YIG films by microwave resonance techniques

Abstract

Measurements of the exchange stiffness $D$ and the exchange constant $A$ of Yttrium Iron Garnet (YIG) films are presented. The YIG films with thicknesses from 0.9 $\mu$m to 2.6 $\mu$m were investigated with a microwave setup in a wide frequency range from 5 to 40 GHz. The measurements were performed when the external static magnetic field was applied in-plane and out-of-plane. The method of Schreiber and Frait, based on the analysis of the perpendicular standing spin wave (PSSW) mode frequency dependence on the applied out-of-plane magnetic field, was used to obtain the exchange stiffness $D$. This method was modified to avoid the influence of internal magnetic fields during the determination of the exchange stiffness. Furthermore, the method was adapted for in-plane measurements as well. The results obtained using all methods are compared and values of $D$ between $(5.18\pm 0.01)\cdot 10^{-17}$T$\cdot$m${}^2$ and $(5.34\pm 0.02)\cdot 10^{-17}$ T$\cdot$m${}^2$ were obtained for different thicknesses. From this the exchange constant was calculated to be $A=(3.65\pm 0.38)$pJ/m.

arXiv comment10 pages, 3 figures, 3 tables

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