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Thickness and temperature dependence of subsidiary absorption thresholds in yttrium-iron-garnet thin films |
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| Authors: | A. V. Pomyalov I. Laulicht J. Barak |
| Affiliation: | a Resnick Institute of Advanced Technology, Bar-Ilan University, Ramat-Gan 52900, Israel b Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel c Soreq Nuclear Research Center, Yavne 70600, Israel |
| Abstract: | The microwave subsidiary absorption threshold in tangentially magnetized yttrium-iron-garnet (YIG) films was measured as a function of the static magnetic field, film thickness and decrease in the 0.3–3 μm range is observed. The effect is explained quantitatively by using modified Damon-Eshbach dispersion relations which take into account exchange interactions. The effect of temperature on hcrit, the smallest threshold field amplitude, in the 250<T< 450 K temperature range can be expressed by an empirical relationship hcrit Ms(T)-1.6 where Ms is the saturation magnetization. This hcrit vs Ms relationship is similar to that obtained for the magnetization dependence of parallel pump thresholds in Li-Ti ferrite compounds. |
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