垂直磁各向异性自旋阀结构中的铁磁共振

Ferromagnetic resonance in spin valve structures with perpendicular anisotropy

本文在理论上研究了垂直磁各向异性自旋阀结构中磁场激发和调节的铁磁共振.通过线性展开包含自旋转移矩项的Landau-Lifshitz-Gilbert方程,获得了磁场激发和调节的铁磁共振谱.给出了共振线宽、共振频率和共振磁场随直流电流密度大小和方向以及直流磁场的变化关系.通过调节直流电流密度的大小和方向,系统的有效阻尼可以达到最小.

A theoretical study is presented on the magnetic-field-excited and adjusted ferromagnetic resonance in the spin valve structures with perpendicular anisotropy. Through linearizing the Landau-Lifshitz-Gilbert equation including the spin-transfer torque term, the magnetic-field-excited and adjusted ferromagnetic resonant spectra are obtained. The dependences of the resonant linewidth, resonant frequency and resonant magnetic field on the magnitude and direction of dc current density and dc magnetic field are shown. The effective damping of the system can be minimized through adjusting the magnitude and the direction of current density.