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PreprintCC BY 4.0arXiv

Spin textures at the Fermi surface of ferromagnets and associated torque

  • T. Valet
  • J. Li
  • H. Jaffrès
  • V. Cros
  • M. Chshiev
  • R. Raimondi
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Abstract

We establish theoretically that transverse spin textures are generically induced by the spin-orbit interaction at the Fermi surface of centrosymmetric ferromagnetic metals. We confirm this prediction with {\em ab initio} computations for Fe, Co and Ni. By symmetry, this cannot be associated with spin-orbit torques under a uniform current. However, a new {\em current-gradient-induced} torque emerges in nanoscale geometries. For a series of Ni-based bilayers, the computed Ni thickness dependence of the current-gradient-induced torque is in quantitative agreement with measurements previously attributed to orbital torques. We discuss how this opens a new avenue for the electrical control of magnetic orders, possibly also including the Néel vector of metallic altermagnets.

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Cite

BibTeXRIS
BibTeX
@misc{valet2026spin,
  title = {{Spin textures at the Fermi surface of ferromagnets and associated torque}},
  author = {T. Valet and J. Li and H. Jaffrès and V. Cros and M. Chshiev and R. Raimondi},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.18800},
  eprint = {2610.18800},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.18800},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Spin textures at the Fermi surface of ferromagnets and associated torque
AU  - T. Valet
AU  - J. Li
AU  - H. Jaffrès
AU  - V. Cros
AU  - M. Chshiev
AU  - R. Raimondi
PY  - 2026
DA  - 2026/10/26
PB  - arXiv
DO  - 10.48550/arxiv.2610.18800
UR  - https://arxiv.org/abs/2610.18800
AB  - We establish theoretically that transverse spin textures are generically induced by the spin-orbit interaction at the Fermi surface of centrosymmetric ferromagnetic metals. We confirm this prediction with {\em ab initio} computations for Fe, Co and Ni. By symmetry, this cannot be associated with spin-orbit torques under a uniform current. However, a new {\em current-gradient-induced} torque emerges in nanoscale geometries. For a series of Ni-based bilayers, the computed Ni thickness dependence of the current-gradient-induced torque is in quantitative agreement with measurements previously attributed to orbital torques. We discuss how this opens a new avenue for the electrical control of magnetic orders, possibly also including the Néel vector of metallic altermagnets.
ER  -