样品几何形状对电感阻尼测量方法的影响
Influence of sample geometry on inductive damping measurement methods
摘要：
我们使用整合电感测试结构来研究不同几何形状的图案化坡莫合金薄膜的旋进频率和有效阻尼。测试结构由制作在不同几何形状的图案化坡莫合金条上的共面波导组成。坡莫合金条的宽度、长度和相对于波导的中心导体的位置是变化的。在平面磁场中，通过时域和频域的电感测量，推导出不同器件的进动频率和有效阻尼。虽然进动频率没有显示出显着的依赖于样品的几何形状，我们发现随着坡莫合金的中心下方的共面波导的中心导体的宽度增加的测量阻尼的减少。我们将这种效应归因于由于坡莫合金条边缘处的不均匀线加宽而产生的额外阻尼贡献，如果坡莫合金条比中心导体宽，则该额外阻尼贡献对感应信号没有贡献。使用这样的综合参考样品的有效阻尼的电感测定的后果进行了讨论。
英文摘要：
We study the precession frequency and effective damping of patterned permalloy thin films of different geometry using integrated inductive test structures. The test structures consist of coplanar wave guides fabricated onto patterned permalloy stripes of different geometry. The width, length and position of the permalloy stripe with respect to the center conductor of the wave guide are varied. The precession frequency and effective damping of the different devices is derived by inductive measurements in time and frequency domain in in-plane magnetic fields. While the precession frequencies do not reveal a significant dependence on the sample geometry we find a decrease of the measured damping with increasing width of the permalloy centered underneath the center conductor of the coplanar wave guide. We attribute this effect to an additional damping contribution due to inhomogeneous line broadening at the edges of the permalloy stripes which does not contribute to the inductive signal provided the permalloy stripe is wider than the center conductor. Consequences for inductive determination of the effective damping using such integrated reference samples are discussed.
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