کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1802975 | 1024608 | 2009 | 6 صفحه PDF | دانلود رایگان |
Ferromagnetic Fe–Co–Hf–N nanocomposite films were investigated concerning their microstructure-dependent frequency behaviour. To modify the composition, the films were deposited by reactive RF magnetron sputtering by using three different 6 in. targets with various Hf fractions. The films were post-annealed up to 600 °C in a static magnetic field to induce an in-plane uniaxial anisotropy and to obtain different crystal sizes. Depending on the annealing temperature, high-frequency losses were investigated by considering the full-width at half-maximum (FWHM) Δfeff of the imaginary part of the frequency-dependent permeability which showed a resonance frequency fFMR of 2.3 GHz for an in-plane uniaxial anisotropy field Hu of 4 mT. The FWHM in correlation with the damping parameter αeff is discussed, e.g., in terms of two-magnon scattering. Damping occurs due to film inhomogeneity in magnetisation and uniaxial anisotropy caused by a magnetocrystalline anisotropy Ha and/or non-magnetic phases. This will result in homogenous or even inhomogeneous resonance line broadening if additional and resonance as well as precession frequencies of independent grains arise.
Journal: Journal of Magnetism and Magnetic Materials - Volume 321, Issue 19, October 2009, Pages 3149–3154