Gilbert damping and saturation magnetization are of critical importance for magnetic thin films in spintronic devices. Using complementary techniques, including ferromagnetic resonance (FMR), superconducting quantum interference device (SQUID) measurements, and energy dispersive x-ray spectroscopy, we demonstrate that Gilbert damping and magnetization in ${\mathrm{Fe}}_{1-x}{\mathrm{B}}_x$ thin films can be tuned by controlling the B concentration $x$. At low B concentration, FMR and SQUID measurements show a strong reduction of the magnetic damping and the saturation magnetization, respectively. A very low magnetic damping of around $3.8\times {10}^{-3}$ is measured at $x=25\%$, which is among the lowest damping values reported so far for a conducting ferromagnet. This tunability of magnetic properties will be useful for fabricating thin films with low damping that can be used in high-performance spintronic devices.

中文翻译：

---

富 BFe1−xBx 薄膜中的可调吉尔伯特阻尼和磁化强度

吉尔伯特阻尼和饱和磁化对于自旋电子器件中的磁性薄膜至关重要。使用铁磁共振 (FMR)、超导量子干涉装置 (SQUID) 测量和能量色散 X 射线光谱等互补技术，我们证明了吉尔伯特阻尼和磁化${铁}_{1-X}{\mathrm{乙}}_X$可以通过控制 B 浓度来调节薄膜$X$。在低 B 浓度下，FMR 和 SQUID 测量结果分别显示磁阻尼和饱和磁化强度大幅降低。周围的磁阻尼非常低$3.8\times {10}^{-3}$测量于$X=25\%$，这是迄今为止报道的导电铁磁体的最低阻尼值之一。这种磁性的可调性将有助于制造可用于高性能自旋电子器件的低阻尼薄膜。