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Effect of sample quantity on the results of ferromagnetic resonance studies of lunar samplesQuantitative ferromagnetic resonance (FMR) measurements at 9.5 and 35 GHz were made on lunar fines in order to determine the amount of single domain FE(0) and to ascertain the effect of sample quantity on the results of these experiments. Samples containing more than 10 micrograms of Fe(0) in an X-band TE(104) cavity, or more than 0.11 micrograms in a Ka-band cavity can cause errors greater than 1% in the quantitative determination of Fe(0), as well as cause anomalous broadening of the FMR line. Theoretical calculations were derived to show this effect which results from a nonlinear response of the FMR experiment with the sample quantity. Using samples of nominal weights, the amount of Fe(0) determined at 34 GHz was 1.1-1.8 times greater than at 9.5 GHz, while the linewidths increased by a factor of 1.2. As the particle size increases, the ratio of Fe(0) determined at 35 GHz to that determined at 9.5 GHz increases, suggesting that the additional iron is due to larger spheroidal particles which change from multidomain to single domain at the larger fields.
Document ID
19790046109
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Goldberg, J. B.
(Rockwell International Science Center Thousand Oaks, CA, United States)
Crowe, H. R.
(Rockwell International Science Center Thousand Oaks, CA, United States)
Housley, R. M.
(Rockwell International Science Center Thousand Oaks, CA, United States)
Cirlin, E. H.
(Rockwell International Science Center Thousand Oaks, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
March 10, 1979
Publication Information
Publication: Journal of Geophysical Research
Volume: 84
Subject Category
Lunar And Planetary Exploration
Accession Number
79A30122
Funding Number(s)
CONTRACT_GRANT: NAS9-11539
Distribution Limits
Public
Copyright
Other

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