Controllable generation of a spin-triplet supercurrent in a Josephson spin-valve
arXiv:1405.4754 · doi:10.1103/PhysRevB.90.134514
Abstract
It has been predicted theoretically that an unconventional odd-frequency spin-triplet component of superconducting order parameter can be induced in multilayered ferromagnetic structures with non-collinear magnetization. In this work we study experimentally nano-scale devices, in which a ferromagnetic spin valve is embedded into a Josephson junction. We demonstrate two ways of in-situ analysis of such Josephson spin valves: via magnetoresistance measurements and via in-situ magnetometry based on flux quantization in the junction. We observe that supercurrent through the device depends on the relative orientation of magnetization of the two ferromagnetic layers and is enhanced in the non-collinear state of the spin valve. This provides a direct prove of controllable generation of the spin-triplet superconducting component in a ferromagnet.
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- Accurate determination of the Josephson critical current by lock-in measurements
- Odd-frequency pairs and anomalous proximity effect in nematic and chiral states of superconducting topological insulators
- In situ transport characterization of magnetic states in Nb/Co superconductor/ferromagnet heterostructures
- Magnetic-field-orientation-dependent triplet supercurrents in Josephson junctions with symmetric and asymmetric exchange-spring interfaces