An apparatus and methodology for high-power SQUID-detected ferromagnetic resonance measurements
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2019Access:
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O'Reilly, J.M. & Stamenov, P. An apparatus and methodology for high-power SQUID-detected ferromagnetic resonance measurements, 2019, AIP Advances, 9, 3Download Item:
Abstract:
Historically, ferromagnetic resonance has been dominated by inductive techniques, for the best part of the last 80 years. It has been only in the last 20 years that non-inductive techniques, such as Ferromagnetic Resonance Force Microscopy (FMRFM) and Magneto-optical Kerr Effect (MOKE), have been used to study, for example, the spatial distribution of resonance modes. Neither of these techniques is absolute - i.e. provides information on the amplitude of excitation as a function of absorbed microwave power. Here we extend on the recent demonstration of SQUID-detected FMR [J. M. O’Reilly and P. Stamenov, Rev. Sci. Instrum. 89, 044701 (2018)], of absolute scalar resonance measurements in single-crystalline and poly-crystalline YIG, at various fields and temperatures, by introducing a new set-up, where the microwave power, instead of being sunk in a matched load at the cryogenic end of the measurement probe is brought back to the ambient environment and is both metered and sunk in high dissipation power (>50 W @ 50 Ω) matching load. The here suggested methodology allows for the absolute excitation amplitude of modes excited during high-power operation of critical microwave devices, such as filters and Y-junction stripline circulators, to be predicted based on direct measurements of the same material in a known geometry.
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Grant Number
Science Foundation Ireland
SFI/12/RC/2278
Author's Homepage:
http://people.tcd.ie/stamenp
Author: Stamenov, Plamen; O'Reilly, James M.
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Science Foundation IrelandType of material:
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AIP Advances;9;
3;
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Ferromagnetic resonance, Magnetism, Squid susceptometer, Spectrum analyzers, Telecommunications engineering, Non linear dynamics, Microwave devicesDOI:
http://dx.doi.org/10.1063/1.5080078Metadata
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