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Updated: Feb 7, 2026

The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
Published on: December 5, 2025
Note: Derivative divide, a method for the analysis of broadband ferromagnetic resonance in the frequency domain
Hannes Maier-Flaig1, Sebastian T B Goennenwein2, Ryo Ohshima3
1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany.
Abstract:
Broadband ferromagnetic resonance (bbFMR) spectroscopy is an established experimental tool to quantify magnetic properties. Due to frequency-dependent transmission of the microwave setup, bbFMR measurements in the frequency domain require a suitable background removal method. Here, we present a measurement and data analysis protocol that allows us to perform quantitative frequency-swept bbFMR measurements without the need for a calibration of the microwave setup. We furthermore compare the results of the proposed frequency space analysis and a conventional analysis in field-space of bbFMR data obtained from a permalloy thin film. The very good agreement of the extracted parameters using the two methods shows the reliability of our method.
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