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Implementation of field-differential phase-resolved microwave magnetic spectroscopy
William Legrand1, Davit Petrosyan1, Hanchen Wang1
1Department of Materials, ETH Zurich, Hönggerbergring 64, 8093 Zurich, Switzerland.
The Review of Scientific Instruments
|March 26, 2025
Summary
This study introduces a novel microwave spectroscopy technique combining phase-resolved detection and magnetic field modulation for enhanced analysis of magnetic systems, improving ferromagnetic resonance (FMR) measurements.
Area of Science:
- Physics
- Materials Science
- Spectroscopy
Background:
- Microwave spectroscopies are essential for studying magnetic systems, identifying resonance modes, and quantifying magnetic parameters.
- Current inductive microwave techniques for magnetization dynamics typically use either field-modulated power detection or phase-resolved detection, with limited integration of both.
- These methods offer distinct advantages but are rarely combined, limiting comprehensive analysis.
Purpose of the Study:
- To develop and apply a novel microwave spectroscopy technique integrating phase-resolved detection and magnetic field modulation.
- To enhance the quantitative measurement of magnetic susceptibility in small-volume magnetic systems.
- To improve the resolution and sensitivity of ferromagnetic resonance (FMR) spectroscopy.
Main Methods:
- Development of customized microwave instrumentation combining phase-resolved detection and magnetic field modulation.
- Application of the technique to ferromagnetic resonance (FMR) spectroscopy.
- Comprehensive modeling and characterization of inductive coupling between magnetic systems and microwave circuits.
Main Results:
- The developed field-differential phase-resolved microwave magnetic spectroscopy significantly improves resolution for closely spaced FMR peaks.
- The technique enhances the detection sensitivity for small magnetic signals.
- Quantitative analysis of resonance peaks is enabled, with effective rejection of errors from permeability, impedance mismatch, and field inhomogeneity.
Conclusions:
- The combined phase-resolved detection and magnetic field modulation technique offers superior performance for microwave magnetic spectroscopy.
- This method provides a powerful tool for quantitative analysis of magnetic parameters in small-volume systems.
- The comprehensive characterization of inductive coupling ensures accurate and reliable FMR measurements.
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