Microstructure and damping in FeTiN and CoFe films

Abstract

Thermally stable films of FeTiN, have been prepared and characterized by ferromagnetic resonance, x-ray diffraction, x-ray photoelecton spectroscopy, and magnetostriction measurements to determine the relationships between the microstructure and the damping constants. The resonance studies were carried out at multiple frequencies to determine the intrinsic damping constant, α, and the extrinsic damping constant, ΔH0, as well as values of the anisotropy field, Hk, the gyromagnetic ratio, γ, and the saturation magnetization value, 4πMs. Data from similar experiments on CoFe films were compared with the FeTiN data. Our results show no relationship between intrinsic damping and the magnetostriction, but a strong dependence of the extrinsic constant on the grain size.

Observation of spin-wave Doppler shift in Co90Fe10/Ru micro-strips for evaluating spin polarization

“…This dispersion relation gives all the material parameters needed to derive the spin polarization in Eq. 1, and our results for them show good agreement with the typical values reported by previous studies [6,49].…”

Observation and analysis of mixed domain states in sputtered Co50Fe50 films

“…the high moment CoFe-alloys, exhibit considerable saturation magnetostriction and crystalline anisotropy as given intrinsic properties. In addition the grain size [8] and texture are relevant microstructural parameters determining the extrinsic magnetic properties important for high frequency applications of sputtered thick films [9]. Whereas the crystalline anisotropy is mostly given by the material composition itself, the large magnetostriction constants together with the actual stress in sputtered films result in additional magneto-elastic anisotropy components.…”

Magnetic properties and structural implications for nanocrystallineFe−Ti−Nthin films

“…References [8] and [9] also show a connection between grain size and the FMR linewidth. However, it is not clear that the linewidth effect is related to grain size or to a structural change.…”

“…8,9 Work from this group has also provided concise data on structure, room temperature magnetization, and anisotropy. [5][6][7]10 Apart from these studies, however, there has been very little definitive work to elucidate the magnetic interactions, identify structural transitions and changes in the magnetic properties associated with these transitions, or to separate the different contributions to the magnetic anisotropy.…”