Electric detection of the thickness dependent damping in Co_(90)Zr_(10) thin films

摘要

In this letter, we propose a dc electrical detection method for investigating the spin dynamics of ferromagnetic thin films. Based on anomalous Hall effect (AHE), the out-of-plane component of the dynamic magnetization can directly rectify the rf current into a time-independent Hall voltage at the ferromagnetic resonance. This method is applied for studying the damping mechanism in Co_(90)Zr_(10) films. The thickness dependent zero-frequency linewidth and the effective Gilbert damping are related to the surface roughness and microstructure evolution. Compared with standard cavity ferromagnetic resonance, the AHE rectification is more suitable for studying the dynamic properties of local magnetic moment.