超低阻尼Fe-Co合金与超导共面波导谐振器的强耦合
Strong coupling of Fe-Co alloy with ultralow damping to superconducting co-planar waveguide resonators
摘要：
本文报道了金属铁磁Fe_（75）Co_（25）薄膜图形元件与超导Nb半波长共面波导（CPW）谐振器之间的强耦合。通过改变铁磁体的体积，我们证明了耦合率与自旋数的平方根成线性关系，并实现了超过700 MHz的耦合率，接近超强耦合制度。在保持恒定磁体积的情况下改变中心导体宽度的实验验证了减小中心导体宽度会增加耦合和协同性。我们的研究结果表明，耦合率的频率依赖性是线性的基本和高次奇次谐波的共面波导，但不同的效率。结果表明，平面超导谐振器/磁混合系统的缩放到更小的尺寸的承诺。
英文摘要：
We report on the strong coupling between a metallic ferromagnetic Fe75Co25 thin film patterned element and a range of superconducting Nb half-wavelength co-planar waveguide (CPW) resonators. By varying the volume of the ferromagnet we demonstrate that the coupling rate scales linearly with the square root of the number of spins and achieve a coupling rate over 700 MHz, approaching the ultrastrong coupling regime. Experiments varying the center conductor width while maintaining constant magnetic volume verify that decreasing the center conductor width increases coupling and cooperativity. Our results show that the frequency dependence of the coupling rate is linear with the fundamental and higher order odd harmonics of the CPW, but with differing efficiencies. The results show promise for scaling planar superconducting resonator/magnetic hybrid systems to smaller dimensions.
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