Abstract
It has previously been shown that the quantity called the "efficient dynamic magnetization", is a powerful tool for characterizing magnetic layers dedicated to microwave applications. It correlates the imaginary part of permeability and the magnetization distribution. This paper presents microwave permeability spectra of a Py/Ru/Py trilayer, which have been measured in the layer plane under an external magnetic static field (HDC) using a single coil cell. The efficient dynamic magnetization versus HDC was found to exhibit a significant decrease for 0<HDC<5 Oe, and it is demonstrated that this decrease was induced by an optic mode excitation.
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