SUPER-MAGNONICS · Coupling of magnetization dynamics and superconducting state in artificial superconductor/ferromagnet hybrid structures
Horizon 2020 — Marie Skłodowska-Curie Actions
- Duration
- 2020-09-01 → 2022-08-31
- EU contribution
- €196,708
- Participants
- 1
- Scheme
- MSCA-IF
Lines connect the coordinator with its partners.
Results in brief
Coupling of magnetization dynamics and superconducting state in artificial superconductor/ferromagnet hybrid structures
The project addresses a problem that has received very little experimental attention despite its fundamental and technological interest: the coupling between superconducting state and magnetization dynamics in artificial superconductor (S) / ferromagnet (F) hybrid structures. The interplay between superconductors and ferromagnets leads to a rich variety of phenomena, which span from the nanoscale confinement of the superconducting condensate to the emergence of unconventional (equal-spin triplet) superconductivity. Two main classes of mechanisms are behind that rich phenomenology: electromagnetic effects (e.g. field screening effects, which dictate the interaction between flux quanta in S and the stray field from F) and “electronic” ones (e.g. penetration of superconducting pairs6 from S into F). The project has important technological implications in non-dissipative spintronics devices, which exploit the spin degree of freedom to store information with the non-dissipative character of the superconducting condensate. The objectives are: WP1: Design an experiment based on S/F hybrids to study the excitation and detection of magnons via dc electrical transport. WP2: Spin pumping via ferromagnetic resonance (FMR) and Inverse Spin Hall effect (ISHE) at S/F interfaces. In this part the goal is to experimentally determine the role of i) the generation of spin-triplet correlations and ii) quasiparticle spin-pumping/diffusion on the coupling between the superconducting state and the magnetization dynamics.
Data: CORDIS, © European Union
Project objective
The proposal addresses a problem that has received very little experimental attention despite its fundamental and technological interest: the coupling between superconducting state and magnetization dynamics in artificial superconductor (S) / ferromagnet (F) hybrid structures. Most of the studies consider that the superconductor is very strongly affected by the interaction with a ferromagnet which, on the contrary, is in a static, equilibrium state and whose order parameter (the magnetization) remains unaffected. However, theoretical studies and a few recent experiments have shown that superconductivity can strongly affect ferromagnetism in various ways. This is the case for instance if one considers low-energy excitations of the magnetization (e.g. magnons), or if one looks at the relaxation from dynamic non-equilibrium states, e.g. the decay of the precession of the macroscopic magnetic moment.In this regard, the proposal has two central objectives, which correspond to two mechanisms of coupling between superconductivity and magnetization dynamics, respectively of electromagnetic and electronic nature. The former objective is concerned with the experimental demonstration of electrical magnon excitation and detection in superconductor/ferromagnet hybrids, that will be applied to the design of dynamic magnonic crystals. Superconductors with different penetrations lengths and intrinsic flux pinning as well as various ferromagnets will be combined. The latter objective involves the understanding of spin pumping and spin diffusion effects in superconductors through ferromagnetic resonance and electrical detection. Special attention will be paid to the used of Yttrium Iron Garnet in insulating ferromagnet/superconductor interfaces, as it presents low intrinsic damping even in thin films. Further combinations with s-wave and d-wave superconductors as well as half-metal ferromagnets will also be explored in this context.
Original text from CORDIS.
Participants
- CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE CNRS · ParisCoordinatorFrance
Links
Data: CORDIS, © European Union