Supercurrent enhancement in Bloch domain walls

Abstract

Conventional spin-singlet Cooper pairs convert into spin-triplet pairs in ferromagnetic Josephson junctions in which the superconductor/ferromagnet interfaces (S/F) are magnetically inhomogeneous. Although much of the theoretical work describing this triplet proximity effect has considered ideal junctions with magnetic domain walls (DW) at the interfaces, in practice it is not easily possible to isolate a DW and propagate a supercurrent through it. The rare-earth magnet Gd can form a field-tuneable in-plane Bloch DW if grown between non-co-linearly aligned ferromagnets. Here we report supercurrents through magnetic Ni-Gd-Ni nanopillars: by field annealing at room temperature, we are able to modify the low temperature DW-state in Gd and this result has a striking effect on the junction supercurrent at 4.2 K. We argue that this result can only be explained in terms of the interconversion of triplet and singlet pairs, the efficiency of which depends on the magnetic helicity of the structure.

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BibTeX RIS

BibTeX

@article{robinson2026supercurrent,
  title = {{Supercurrent enhancement in Bloch domain walls}},
  author = {J. W. A. Robinson and F. Chiodi and M. Egilmez and Gábor B. Halász and M. G. Blamire},
  journal = {Scientific Reports},
  year = {2026},
  month = oct,
  doi = {10.1038/srep00699},
  url = {https://hal.science/hal-05792046v1},
  note = {CC BY-NC-ND},
}

RIS

TY  - JOUR
TI  - Supercurrent enhancement in Bloch domain walls
AU  - J. W. A. Robinson
AU  - F. Chiodi
AU  - M. Egilmez
AU  - Gábor B. Halász
AU  - M. G. Blamire
PY  - 2026
DA  - 2026/10/11
JO  - Scientific Reports
DO  - 10.1038/srep00699
UR  - https://hal.science/hal-05792046v1
AB  - Conventional spin-singlet Cooper pairs convert into spin-triplet pairs in ferromagnetic Josephson junctions in which the superconductor/ferromagnet interfaces (S/F) are magnetically inhomogeneous. Although much of the theoretical work describing this triplet proximity effect has considered ideal junctions with magnetic domain walls (DW) at the interfaces, in practice it is not easily possible to isolate a DW and propagate a supercurrent through it. The rare-earth magnet Gd can form a field-tuneable in-plane Bloch DW if grown between non-co-linearly aligned ferromagnets. Here we report supercurrents through magnetic Ni-Gd-Ni nanopillars: by field annealing at room temperature, we are able to modify the low temperature DW-state in Gd and this result has a striking effect on the junction supercurrent at 4.2 K. We argue that this result can only be explained in terms of the interconversion of triplet and singlet pairs, the efficiency of which depends on the magnetic helicity of the structure.
SN  - 2045-2322
ER  -

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