论文标题
使用氧化屏障的NBN绝缘子 - 铁磁铁隧道连接点使用自旋化测量
Spin-Polarisation measurement using NbN-Insulator-Ferromagnet Tunnel Junction with oxidized barrier
论文作者
论文摘要
我们报告了使用NBN作为超导电极及其表面氧化物作为绝缘隧道屏障的超导体 - 绝缘体正常金属隧道连接的两步过程，并研究了其使用Meserve-Tedrow技术测量效能电磁体的自旋偏置的功效。我们观察到，对于低于10 nm的NBN膜厚度，在平行磁场的应用下，状态的超导密度显示出明显的“ zeeman”分裂成旋转和旋转的子频段。使用铁电磁CO用作正常电极的设备上的隧道测量表明，这些设备可用于在高达1.6 K的温度下可靠地测量铁磁体的自旋极化。我们制造过程的简单性，以及在4he的温度下进行旋转测量的能力，可以使NBN具有非常有吸引力的旋转测量，以使其具有非常有吸引力的旋转旋转量化。
We report a two-step process for the fabrication of superconductor-insulator-normal metal tunnel junctions using NbN as the superconducting electrode and its surface oxide as the insulating tunnel barrier, and investigate its efficacy in measuring spin-polarisation of ferromagnets using the Meservey-Tedrow technique. We observe that for NbN film thickness below 10 nm, under the application of parallel magnetic field, the superconducting density of states show clear "Zeeman" splitting into spin-up and spin-down sub-bands. Tunnelling measurements on devices where ferromagnetic Co is used as the normal electrode shows that these devices can be used to reliably measure spin polarisation of a ferromagnet at temperatures up to 1.6 K. The simplicity of our fabrication process, and the ability to perform spin-polarisation measurements at 4He temperatures makes NbN a very attractive candidate for spin polarisation measurements.
