DocumentCode
1198871
Title
FMR spectra of oriented γ-Fe2O3, Co-γ-Fe2O3, CrO2 and MP tapes
Author
Yu, Y. ; Harrell, J.W.
Author_Institution
Dept. of Phys. & Astron., Alabama Univ., Tuscaloosa, AL, USA
Volume
30
Issue
6
fYear
1994
fDate
11/1/1994 12:00:00 AM
Firstpage
4083
Lastpage
4085
Abstract
Ferromagnetic resonance spectra have been measured at 34.5 GHz on oriented γ-Fe2O3, Co-γ-Fe2O 3, CrO2 and MP tapes. Particle orientation distribution functions were determined by measuring the angular dependence of remanence. The distribution functions were used to calculate FMR spectra using the Landau-Lifshitz equation and the method of Netzelmann. The anisotropy energy, packing fraction and damping constant were adjusted in order to fit the data. The values of the damping constants obtained from the fits ranged from a low of 0.051 for CrO2 to a high of 0.92 for MP. These values, including previously measured damping constants for Ba-ferrite, correlate well with the switching speed measurements of Doyle and co-workers, which show CrO2 to be the slowest and MP the fastest
Keywords
chromium compounds; cobalt; ferromagnetic resonance; iron compounds; magnetic anisotropy; magnetic particles; magnetic switching; magnetic tapes; remanence; γ-Fe2O3; 34.5 GHz; Co-γ-Fe2O3; CrO2; FMR spectra; Fe2O3; Fe2O3:Co; Landau-Lifshitz equation; MP; anisotropy energy; damping constant; ferromagnetic resonance spectra; metal particle; oriented tapes; packing fraction; particle orientation distribution functions; remanence; switching speed; Damping; Distribution functions; Extraterrestrial measurements; Magnetic anisotropy; Magnetic field measurement; Magnetic resonance; Particle measurements; Perpendicular magnetic anisotropy; Remanence; Velocity measurement;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/20.333996
Filename
333996
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