To develop low-moment, low-damping metallic ferromagnets for power-efficient spintronic devices, it is crucial to understand how magnetic relaxation is impacted by the addition of nonmagnetic elements. Here, we compare magnetic relaxation in epitaxial $\mathrm{Fe}$ films alloyed with light, nonmagnetic elements of $\mathrm{V}$ and $\mathrm{Al}$. $\mathrm{Fe}\text{−}\mathrm{V}$ alloys exhibit lower intrinsic damping compared with that of pure $\mathrm{Fe}$, reduced by nearly a factor of 2, whereas damping in $\mathrm{Fe}\text{−}\mathrm{Al}$ alloys increases with $\mathrm{Al}$ content. Our experimental and computational results indicate that reducing the density of states at the Fermi level, rather than the average atomic number, has a more significant impact on lowering damping in $\mathrm{Fe}$ alloyed with light elements. Moreover, $\mathrm{Fe}\text{−}\mathrm{V}$ is confirmed to exhibit an intrinsic Gilbert damping parameter of about 0.001, which is among the lowest ever reported for ferromagnetic metals.

中文翻译：

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钒铝合金化外延铁中的磁阻尼

为了开发用于高能效自旋电子器件的低力矩，低阻尼金属铁磁体，了解非磁性元素对磁弛豫的影响至关重要。在这里，我们比较外延的磁弛豫$铁$ 与轻，非磁性元素合金化的薄膜 $\mathrm{V}$ 和 $铝$。 $铁\text{-}\mathrm{V}$ 合金比纯合金具有更低的固有阻尼 $铁$，减少了将近2倍，而阻尼 $铁\text{-}铝$ 合金随着 $铝$内容。我们的实验和计算结果表明，降低费米能级的态密度而不是平均原子序数，对降低硅中的阻尼具有更大的影响。$铁$与轻元素合金化。此外，$铁\text{-}\mathrm{V}$ 证实其表现出的固有吉尔伯特阻尼参数约为0.001，这是有史以来铁磁金属中最低的。