钒铝合金化外延铁的磁阻尼
Magnetic Damping in Epitaxial Fe Alloyed with Vanadium and Aluminum
摘要：
为了开发低磁矩，低阻尼的金属铁磁体用于功率效率的自旋电子器件，关键是要了解磁弛豫是如何通过添加非磁性元素来影响的。在这里，我们比较轻的V和Al元素合金化的外延Fe膜的磁弛豫。FeV合金表现出较低的固有阻尼相比，纯铁，减少了近2倍，而在FeAl合金中的阻尼随Al含量增加。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，有更显着的影响，在降低阻尼铁合金轻元素。此外，FeV被证实表现出固有的吉尔伯特阻尼参数为$\simeq$ 0.001，其中最低的铁磁金属。
英文摘要：
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 Fe films alloyed with light nonmagnetic elements of V and Al. FeV alloys exhibit lower intrinsic damping compared to pure Fe, reduced by nearly a factor of 2, whereas damping in FeAl alloys increases with 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 in lowering damping in Fe alloyed with light elements. Moreover, FeV is confirmed to exhibit an intrinsic Gilbert damping parameter of $\simeq$0.001, among the lowest ever reported for ferromagnetic metals.
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