Study of Peculiarities of the Microwave Absorption Spectrum of Nanocrystalline Thin Magnetic Films

Based on the micromagnetic model which takes into account the random distribution of the uniaxial magnetic anisotropy directions in crystallites of a nanocrystalline film, an effective method has been implemented for calculation of the magnetization dynamics in microwave fields. For a certain range...

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Bibliographic Details
Published in:Russian physics journal 2019-02, Vol.61 (10), p.1798-1805
Main Authors: Belyaev, B. A., Boev, N. M., Izotov, A. V., Solovev, P. N.
Format: Article
Language:English
Subjects:
Absorption spectra
Analysis
Anisotropy
Asymmetry
Broken symmetry
Condensed Matter Physics
Crystallites
Electromagnetism
Ferromagnetic resonance
Ferromagnetism
Hadrons
Heavy Ions
Lasers
Magnetic anisotropy
Magnetic films
Magnetization
Mathematical and Computational Physics
Microwave absorption
Nanocrystals
Nuclear Physics
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Slopes
Theoretical
Thin films
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Summary:Based on the micromagnetic model which takes into account the random distribution of the uniaxial magnetic anisotropy directions in crystallites of a nanocrystalline film, an effective method has been implemented for calculation of the magnetization dynamics in microwave fields. For a certain range of crystallite sizes, when the energy of the random magnetic anisotropy is comparable to the exchange energy, a significant change of the ferromagnetic resonance field, broadening of the resonance line, and the appearance of an asymmetry in the shape of the resonance curve were found. With an increase of the crystallite sizes, the resonance field first grows, then, it quickly decreases to its minimum, and then, it grows again to reach saturation. In this case, the steepness of the left slope of the broadening resonance curve first decreases faster than that of the right slope, leading to the symmetry breaking of the resonance curve shape, then, the curve becomes symmetrical again, and then, the steepness of the left slope becomes greater than that of the right slope.
ISSN:1064-8887
1573-9228
DOI:10.1007/s11182-019-01603-4