Observation of the magnetic spin Hall effect in a ferromagnet

@misc{daveygarcia2026observation,
  title = {{Observation of the magnetic spin Hall effect in a ferromagnet}},
  author = {Nicholas Davey-García and Jone Mencos and Luciano Bravo and Inge Groen and Luis E. Hueso and Andreas Berger and Fèlix Casanova},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.25406},
  eprint = {2609.25406},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.25406},
}

TY  - UNPB
TI  - Observation of the magnetic spin Hall effect in a ferromagnet
AU  - Nicholas Davey-García
AU  - Jone Mencos
AU  - Luciano Bravo
AU  - Inge Groen
AU  - Luis E. Hueso
AU  - Andreas Berger
AU  - Fèlix Casanova
PY  - 2026
DA  - 2026/09/21
PB  - arXiv
DO  - 10.48550/arxiv.2609.25406
UR  - https://arxiv.org/abs/2609.25406
AB  - The conventional spin Hall effect generates spin currents whose flow direction, spin polarization, and driving electric field are mutually perpendicular. Magnetic order lifts this symmetry restriction and enables additional time-reversal-symmetry-odd components of the spin-conductivity tensor, giving rise to the magnetic spin Hall effect (MSHE). These components also couple the generated spin polarization to the magnetic order, providing a degree of control absent in the conventional spin Hall effect. Although the MSHE has been observed in antiferromagnets, its experimental identification in conventional ferromagnets has remained elusive. Here, using a non-local lateral spin-valve geometry, we electrically identify the MSHE and its reciprocal effect in a perpendicularly magnetized Co-based multilayer. Reversal of the multilayer magnetization reverses the MSHE and magnetic inverse spin Hall signals, revealing their time-reversal-symmetry-odd character and magnetization control. By contrast, the conventional spin Hall and inverse spin Hall signals measured in the same devices remain unchanged under magnetization reversal, consistent with their time-reversal-symmetry-even character. We obtain a magnetic spin Hall angle of θ_MSH = (3.8 ± 0.6)%, comparable in magnitude to the spin Hall angle of heavy metals commonly used in spintronic devices, such as Pt. These results establish the MSHE as a sizable, magnetically switchable spin-charge interconversion mechanism in conventional ferromagnets.
ER  -