Anisotropic Ferromagnetic Resonance Linewidth in Ni Platelets

Abstract

We have measured in-plane and out-of-plane ferromagnetic resonance linewidths of single-crystal Ni platelets at 25.92 and 9.42 GHz. It is observed that the intrinsic linewidth of these samples is anisotropic at 25.92 GHz, exhibiting cubic crystalline anisotropy rather than the geometrical symmetry of the sample. We propose that the anisotropic part of the intrinsic linewidth is due to direct relaxation of the magnetic energy to the lattice.