Abstract
We investigate the ferromagnetic resonance (FMR) response of microfabricated microwave resonators loaded with small alloy rectangles. A major increase in the FMR signal-to-noise ratio is achieved by employing the microwave-resonator structure. A FMR peak shift similar to that of continuous films is measured in the presence of hydrogen gas in the sample environment. We show that the very high sensitivity of the FMR signal of the alloy rectangle to hydrogen exposure can be used to measure relatively small hydrogen-concentration steps near 100% . Additionally, we also demonstrate that this structure can measure hydrogen over a concentration range from 3% to 100% in . In time-dependent FMR measurements, we discover a temperature dependence of the FMR signal, which we relate to intrinsic temperature-dependent changes in saturation magnetization and the magnetic anisotropy of the - alloy.
5 More- Received 19 January 2022
- Revised 16 May 2022
- Accepted 25 May 2022
DOI:https://doi.org/10.1103/PhysRevApplied.18.024015
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