Crossover between short and long range proximity effects in SFS junctions with Ni-based ferromagnets

Autor:	Kapran, O. M., Golod, T., Iovan, A., Sidorenko, A. S., Golubov, A. A., Krasnov, V. M.
Rok vydání:	2021
Předmět:	Condensed Matter - Superconductivity Physics - Applied Physics
Zdroj:	Phys. Rev. B 103, 094509 (2021)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.103.094509
Popis:	We study Superconductor/Ferromagnet/Superconductor junctions with CuNi, PtNi, or Ni interlayers. Remarkably, we observe that supercurrents through Ni can be significantly larger than through diluted alloys. The phenomenon is attributed to the dirtiness of disordered alloys leading to a short coherence length despite a small exchange energy. To the contrary, pure Ni is clean resulting in a coherence length as long as in a normal metal. Analysis of temperature dependencies of critical currents reveals a crossover from short (dirty) to long (clean) range proximity effects in Pt1-xNix with increasing Ni concentration. Our results point out that structural properties of a ferromagnet play a crucial role for the proximity effect and indicate that conventional strong-but-clean ferromagnets can be advantageously used in superconducting spintronic devices. Comment: 14 pages, 8 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2102.10927 Zobrazit plný text záznamu View this record from Arxiv