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Ferromagnetic Resonance Revised - Electrodynamic Approach
Jerzy Krupka1, Pavlo Aleshkevych2, Bartlomiej Salski3
1Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Warsaw, 00662, Poland. krupka@imio.pw.edu.pl.
Scientific Reports
|July 20, 2017
Summary
Magnetic plasmon resonance (MPR) in ferromagnetic spheres allows for precise determination of ferromagnetic resonance (FMR) linewidth (ΔH) by measuring the Q-factor. This method accounts for all system losses, simplifying linewidth analysis.
Area of Science:
- Physics
- Materials Science
- Electromagnetism
Background:
- Uniform precession mode in ferromagnetic spheres is identified as magnetic plasmon resonance (MPR).
- Ferromagnetic resonance (FMR) linewidth (ΔH) is a key parameter for magnetized gyromagnetic materials.
Purpose of the Study:
- To investigate the relationship between the Q-factor at MPR and the FMR linewidth (ΔH).
- To demonstrate that ΔH can be unequivocally determined from the MPR Q-factor.
Main Methods:
- Electrodynamic study involving a transcendental equation to analyze resonance system losses.
- Measurement of Q-factors on a monocrystalline yttrium iron garnet (YIG) sphere.
Main Results:
- A rigorous method is presented to determine ΔH from the MPR Q-factor, accounting for all losses.
- Electric losses have a minimal impact on ΔH due to a high magnetic to electric energy storage ratio at MPR.
- Theoretical predictions are validated by experimental Q-factor measurements on a YIG sphere.
Conclusions:
- The Q-factor at MPR provides a direct and accurate measure of the FMR linewidth (ΔH).
- The proposed electrodynamic approach simplifies the determination of ΔH in gyromagnetic materials.
- MPR offers a valuable tool for characterizing magnetic properties of materials.
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