WP1. Microwave excitation and dc transport detection in S/F hybrids.
Work performed: In this part we design and tested an experiment to excite spin waves in a ferromagnetic coplanar waveguide (CPW) and study the stray field created by the collective excitations with the periodic field modulation created by a vortex lattice in an adjacent type II superconductor.
Main results: The main scientific and technological achievement of this WP is the possibility to detect spin waves at cryogenics temperatures, despite the linewidth broadening of the YIG. The experience acquired in the fabrication and characterization of these devices provides a good base ground to conceive magnonic filters based on s-wave or even high Tc superconductors.
Exploitation of the results: The host institution will exploit these results in the short term, in a new research line dedicated to superconductor/ferromagnet hybrids, and in the middle period to the dedicated scientific community. In the long term, these results are expected to be exploited in the RF industry of communications.
WP2. Spin pumping via ferromagnetic resonance (FMR) and Inverse Spin Hall effect (ISHE) at S/F interfaces.
Work performed: Here we conducted ferromagnetic resonance and Inverse Spin Hall effect experiments to characterize the electronic coupling between the superconducting state and the magnetization dynamics in superconductor/ferromagnet hybrids. In particular, we analyzed superconductor/ferromagnet heterostructures from three different aspects,
i) the generation of spin-triplet correlations
ii) quasiparticle spin-pumping/diffusion and
iii) The performance of d-wave superconductors for non-dissipative spin transport and the influence of the gap anisotropy.
Main results:
1. We showed the influence of the d-wave gap anisotropy on the spin pumping efficiency in d-wave superconductor/ferromagnet heterostructures.
2. We found a large spin-to-charge conversion efficiency in YIG/s-wave SC using local detection methods.
3. We developed a novel growth process to integrate garnets and perovskites in hybrids systems.
4. We provided evidence that suggests the presence of spin-triplet supercurrents detected from spin-pumping experiments in d-wave superconductor/ferromagnet hybrids.
Exploitation of the results for both WPs: The host institution will exploit these results in the short term, in a new research line dedicated to superconductor/ferromagnet hybrids, and in the middle period to the dedicated scientific community. In the long term, these results are expected to be exploited in the RF industry of communications.
