Crossover between short- And long-range proximity effects in superconductor/ferromagnet/superconductor junctions with Ni-based ferromagnets
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KAPRAN, Olena, GOLOD, Taras, IOVAN, Adrian, SIDORENKO, Anatolie, GOLUBOV, Alexander, KRASNOV, Vladimir. Crossover between short- And long-range proximity effects in superconductor/ferromagnet/superconductor junctions with Ni-based ferromagnets. In: Physical Review B, 2021, vol. 103, p. 0. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.103.094509
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Physical Review B
Volumul 103 / 2021 / ISSN 2469-9950 /ISSNe 2469-9969

Crossover between short- And long-range proximity effects in superconductor/ferromagnet/superconductor junctions with Ni-based ferromagnets

DOI: https://doi.org/10.1103/PhysRevB.103.094509

Pag. 0-0

Kapran Olena1, Golod Taras1, Iovan Adrian12, Sidorenko Anatolie34, Golubov Alexander56, Krasnov Vladimir16
 
1 Stockholm University,
2 Royal Institute of Tehcnology,
3 Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu",
4 Oryol State University named after I.S. Turgenev, Russia,
5 University of Twente, Netherlands,
6 Moscow Institute of Physics and Technology
 
Disponibil în IBN: 30 martie 2021


Rezumat

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.

Cuvinte-cheie
Binary alloys, Copper alloys, Ferromagnetic materials, ferromagnetism, Magnets, Platinum alloys, Superconducting devices, Superconducting materials