Investigation of magnetization dynamics in spin-wave metamaterials

点击翻译按钮获取中文摘要

We constructed an analytical model for precession of a magnetic moment in spin-wave metamaterials consisting of interacting magnetic nanoparticles. It is revealed that the Gilbert damping factor can be controlled by the structure of the metamaterials. Additionally, analytical equations of the macroscopic damping factor were obtained for spin-torque oscillation in the spin-wave metamaterials. The equations indicated that the effective damping factor is dependent on the spin currents whereas the frequency of spin torque oscillation is independent of the spin currents. Moreover, we have experimentally succeeded in fabricating artificial chiral structures made of ferromagnetic-metals and observing a characteristic signal in electron spin resonance spectra. The present study is bringing together metamaterials and spintronics via spin-waves.