带畴结构软磁FeTaC薄膜磁阻尼的自旋动力学和频率依赖性研究
Spin dynamics and frequency dependence of magnetic damping study in soft ferromagnetic FeTaC film with a stripe domain structure
摘要：
在磁性隧道结器件中，利用自旋转移矩技术实现自由层磁化翻转的关键因素是磁各向异性和低磁阻尼。采用微带铁磁共振技术，在宽频带范围内研究了具有条畴结构的软磁FeTaC薄膜的磁化进动动力学。考虑薄膜总自由能量密度，利用Landau-Lifshitz-Gilbert方程数值分析了不同频率下谐振场和线宽的极角变化。数值估计的参数Landé $g$ -因子，PMA常数，和有效磁化被发现分别为2.1，2 $\times10^{5}$ erg/cm $^{3}$和7145 Oe。通过在总线宽分析中考虑本征和非本征效应，评估了吉尔伯特阻尼参数（$α$）的频率依赖性。发现$α$的值在10 GHz处为0.006，并且其随着岁差频率的减小而增大。
英文摘要：
Perpendicular magnetic anisotropy (PMA) and low magnetic damping are the key factors for the free layer magnetization switching by spin transfer torque technique in magnetic tunnel junction devices. The magnetization precessional dynamics in soft ferromagnetic FeTaC thin film with a stripe domain structure was explored in broad band frequency range by employing micro-strip ferromagnetic resonance technique. The polar angular variation of resonance field and linewidth at different frequencies have been analyzed numerically using Landau-Lifshitz-Gilbert equation by taking into account the total free energy density of the film. The numerically estimated parameters Landé $g$-factor, PMA constant, and effective magnetization are found to be 2.1, 2$\times10^{5}$ erg/cm$^{3}$ and 7145 Oe, respectively. The frequency dependence of Gilbert damping parameter ($α$) is evaluated by considering both intrinsic and extrinsic effects into the total linewidth analysis. The value of $α$ is found to be 0.006 at 10 GHz and it increases with decreasing precessional frequency.
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