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Interfacial orbital torques excite nanoscale terahertz magnons — arXiv:2609.01118

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.01118
License (as archived): CC0-1.0
Archived: 2026-10-17T07:21:08.344Z
SHA-256 of the archived text: 47b7c991eee7e44806dcee840eebf3a77ec104b2380a9a544e538b981dc8b518
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Interfacial orbital torques excite nanoscale terahertz magnons — arXiv:2609.01118 — arXiv (en), https://arxiv.org/abs/2609.01118 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_e0eee893256f (Metraipolis archive dc_e0eee893256f, sha256 47b7c991eee7e44806dcee840eebf3a77ec104b2380a9a544e538b981dc8b518)

BibTeX

@misc{dce0eee893256f,
  title = {Interfacial orbital torques excite nanoscale terahertz magnons — arXiv:2609.01118},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.01118},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_e0eee893256f; sha256 47b7c991eee7e44806dcee840eebf3a77ec104b2380a9a544e538b981dc8b518},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.01118. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Exchange-dominated magnons in nanometer-thick ferromagnets extend to the terahertz regime through thickness quantization of perpendicular standing spin-wave (PSSW) modes. While interfacial spin-orbit torques (SOTs) have been shown to enable the excitation of such modes, the microscopic origin of the interfacial driving torque remains unclear. In particular, the coexistence of spin and orbital currents complicates the understanding. Here, we develop and use an atomistic framework that explicitly resolves interfacial symmetries and separates spin and orbital torque contributions. Exploiting a trilayer geometry for a thin ferromagnet sandwiched between non-magnetic layers, where the symmetry-controlled polarity of the interfacial torque produces mode-selective magnon excitation as observed in the recent experiment of Salikhov et al. Nature Phys. 19, 529 (2023), we disentangle the different interfacial torque contributions. By decomposing the torque into magnetization-even (field-like) and magnetization-odd components, we identify the field-like torque as the dominant contribution responsible for the excitation. Crucially, isolating orbital and spin contributions reveals that the interfacial orbital torque provides the primary channel for the efficient excitation of exchange-dominated THz magnons in thin ferromagnets. Our results establish a microscopic basis for symmetry-engineered control of confined terahertz spin dynamics in magnetic multilayers.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-02 in cond-mat.stat-mech).
Categorie arXiv: Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ; Statistical Mechanics (cond-mat.stat-mech).
Pagina del lavoro: https://arxiv.org/abs/2609.01118 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-17T07:14:32.218Z dalla pagina https://arxiv.org/catchup/cond-mat.stat-mech/2026-09-02?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).