Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
Huygens Laboratory, Leiden University, PO Box 9504, 2300 RA Leiden, The Netherlands.
Nat Commun. 2014;5:3048. doi: 10.1038/ncomms4048.
Spin selectivity in a ferromagnet results from a difference in the density of up- and down-spin electrons at the Fermi energy as a consequence of which the scattering rates depend on the spin orientation of the electrons. This property is utilized in spintronics to control the flow of electrons by ferromagnets in a ferromagnet (F1)/normal metal (N)/ferromagnet (F2) spin valve, where F1 acts as the polarizer and F2 the analyser. The feasibility of superconducting spintronics depends on the spin sensitivity of ferromagnets to the spin of the equal spin-triplet Cooper pairs, which arise in superconductor (S)-ferromagnet (F) heterostructures with magnetic inhomogeneity at the S-F interface. Here we report a critical temperature dependence on magnetic configuration in current-in-plane F-S-F spin valves with a holmium spin mixer at the S-F interface providing evidence of a spin selectivity of the ferromagnets to the spin of the triplet Cooper pairs.
自旋选择性是由于费米能级处上下自旋电子的密度不同而导致的，因此散射率取决于电子的自旋方向。这一特性在自旋电子学中被用来控制通过铁磁体（F1）/正常金属（N）/铁磁体（F2）自旋阀中电子的流动，其中 F1 作为起偏器，F2 作为分析器。超导自旋电子学的可行性取决于铁磁体对超导（S）-铁磁体（F）异质结构中自旋相等的三重态库珀对自旋的自旋灵敏度，这种异质结构在 S-F 界面处存在磁各向异性。在这里，我们报道了在具有钬自旋混合器的面内电流 F-S-F 自旋阀中，磁构型对临界温度的依赖性，这为铁磁体对三重态库珀对自旋的自旋选择性提供了证据。
