Implementation of field-differential phase-resolved microwave magnetic spectroscopy
Résumé
Microwave spectroscopies are central to the investigation of magnetic systems, by enabling the identification of their dynamical resonance modes and by providing quantitative information on key magnetic parameters. Experiments on magnetization dynamics based on inductive microwave techniques usually rely on either field-modulated power detection or phase-resolved detection using a vector network analyzer. While these two approaches bring separate advantages, they have rarely been combined together. In this work, we develop a customized microwave instrumentation combining phase-resolved detection and modulation of magnetic field to perform microwave spectroscopy of magnetic systems. We apply this technique to ferromagnetic resonance, where it enables a quantitative measurement of the magnetic susceptibility in systems with small volume and magnetization. Further, we model and characterize comprehensively the inductive coupling of the magnetic system to the microwave circuit, which provides a quantitative analysis of the resonance peaks and enables the rejection of potential errors originating from a too strong permeability, imperfect impedance matching, broadening induced by field inhomogeneity and varying sample placement.
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