Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
75 (1994), S. 5919-5921
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The design and performance of a microwave transmission spectrometer operating in the 12.4–18 GHz frequency range is described. This spectrometer measures the microwave power passing through a magnetic, metallic sample as a function of temperature and applied magnetic field. Significant features of the apparatus are the use of a solid state microwave amplifier as the homodyne receiver's front end and the inclusion of a calibration signal which is injected into the receiver simultaneously with the signal to be measured. The excellent noise figure (〈2 dB) and gain ((approximately-greater-than)34 dB) of the amplifier yield a receiver sensitivity of ≈10−20 W in a 1 Hz bandwidth. The present microwave source is a dielectric resonant oscillator which generates 100 mW at 16.95 GHz, although the system can also operate with a klystron or microwave sweep oscillator locked to any frequency between 12.4 and 18 GHz. The first use of the system was to measure the transmission through the amorphous ferromagnet Metglas(R) 2605SC (Allied Chemical Corporation). A peak in the transmission was observed at ferromagnetic resonance. This transmission peak was contaminated by a signal going around, not through, the sample which we tentatively identify with surface acoustic waves.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.355512
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