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FMR Line Splitting in Fe/Cr Multilayers
Author(s) -
Akinshina L. P.,
Kobelev A. V.,
Koshta A. A.,
Milyaev M. A.,
Minin V. I.,
Romanyukha A. A.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199907)214:1<153::aid-pssb153>3.0.co;2-z
Subject(s) - line (geometry) , materials science , metallurgy , geometry , mathematics
Measurements of the magnetization curves and ferromagnetic resonance (FMR) were made on a series of samples of multilayers [Fe(13 Å)/Cr( t Cr )] 12 , with 7Å > t Cr > 40 Å, deposited by the method of molecular‐beam epitaxy on a sapphire substrate with the Fe buffer layer of 40 Å thickness. The effective demagnetizing field 4π M s — H ′ u was estimated for all samples from the angular dependence of an FMR resonant field and linewidth for the uniform mode at the transverse excitation, where M s is the saturation magnetization of the Fe layer, H ′ u is the uniaxial anisotropy field. An additional FMR line was observed for samples with small spacer thickness ( t Cr > 16 Å). Its intensity was equal to that of a main line under the condition of t Cr ≈ t Fe ≈ 12 Å, decreasing down to zero both at reduction, and at the increase of t Cr . The FMR lineshape in a field parallel to the surface was simulated by a superposition of two curves, possessing in view of the magnetization curve approximately Lorentzian shape with different effective field values H ′ u . The possible reason of the features observed can be the formation of regions with different effective anisotropy field values in a sample plane during the deposition. For all samples investigated at longitudinal excitation, an FMR signal which corresponds to an optical mode was not observed.