Ferromagnetic resonance and damping in granular Co–Cr films with perpendicular anisotropy

Abstract

The 17.3 GHz ferromagnetic resonance field (HFMR) and linewidth (ΔH) have been measured as a function of the angle (θH) between the external magnetic field and film normal for a 16 nm thick Co–Cr granular film with uniaxial perpendicular anisotropy. The HFMR(θH) response is significantly different from the uniform rotation prediction. The ΔH(θH) dependence shows major deviations from the Gilbert phenomenological damping model. Both dependences can be modeled simultaneously through a combination of two-magnon scattering processes, inhomogeneity line broadening, and an intrinsic damping from magnon-electron scattering processes, with a Gilbert damping α-value of 0.004.

A broadband ferromagnetic resonance spectrometer to measure thin films up to 70 GHz

“…This can also yield information about damping and separate the contributions to the damping from individual relaxation processes. 14 under investigation is also important to study magnetic phase transitions. [16][17][18] The spectrometer we built and report here incorporates these functionalities as much as possible, while maintaining certain design considerations.…”

Interlayer Exchange Coupling in Magnetic Hard-Soft Bilayered Structures

“…magnetized perpendicularly. 26,27 Second, the observed thickness dependence may be associated mainly with the thickness dependence of H ex , since the data in Figs. 3(a) and 3(b) seem to show similar overall trends.…”

The contributions of intrinsic damping and two magnon scattering on the ferromagnetic resonance linewidth in [Fe65Co35/SiO2]n multilayer films

“…More attentions have been paid to the damping in the single-layer nano-granular magnetic film [10,11], magnetic * Corresponding author. Tel.…”

“…Up to now, there are lots of published theoretical and experimental results on the microwave damping mechanism of magnetic materials [5][6][7][8][9][10][11][12][13]. More attentions have been paid to the damping in the single-layer nano-granular magnetic film [10,11], magnetic * Corresponding author.…”