{
  "abstract": "On-chip micromagnets generate local magnetic-field asymmetries, enabling electrical control of spin qubits via electric dipole spin resonance and their integration into circuit quantum electrodynamics (QED) architectures. Accurate prediction of spin-qubit performance requires modeling micromagnet stray fields beyond the saturated-magnet approximation, accounting for nonuniform magnetization. Here, we combine thin-film characterization of Co, Co/Ta multilayers, and CoFe films with nanoscale stray-field measurements using NV-center magnetometry in the unsaturated regime to establish a reliable micromagnetic simulation framework. We show that CoFe micromagnets generate antisymmetric fields in double quantum-dot geometries exceeding ±100 mT, owing to their high saturation magnetization and favorable magnetocrystalline anisotropy. For spin qubits coupled to microwave resonators, the predicted spin-photon coupling reaches |gs/gc| ≈ 0.5, where g c denotes the charge-photon coupling strength of the underlying charge qubit, highlighting the potential for high-fidelity operations in circuit QED architectures.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
      "name": "S Lopes"
    },
    {
      "name": "Q. Schaeverbeke"
    },
    {
      "name": "M. M. Desjardins"
    },
    {
      "name": "D Lacour"
    },
    {
      "name": "M Hehn"
    },
    {
      "name": "F Montaigne"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/8hbraxfff6njp.bib",
  "cited_by": 0,
  "doi": "10.1021/acs.nanolett.6c01469",
  "fulltext_url": null,
  "id": "8hbraxfff6njp",
  "issns": [
    "1530-6984",
    "1530-6992"
  ],
  "landing_url": "https://hal.science/hal-05727431v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "0.spi"
    ],
    [
      "hal",
      "1.phys.cond"
    ],
    [
      "hal",
      "1.spi.nano"
    ],
    [
      "openalex",
      "3107|Quantum and electron transport phenomena"
    ]
  ],
  "openalex": "W7171451445",
  "pdf_url": "https://hal.science/hal-05727431/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-26",
  "publisher": "American Chemical Society",
  "ris": "https://research.draconitic.com/paper/8hbraxfff6njp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:21Z",
      "native_id": "hal-05727431",
      "source": "hal",
      "url": "https://hal.science/hal-05727431v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:1.phys.cond",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Nanoscale Stray Fields from Micromagnets for Optimal Spin Qubit Architecture",
  "title_text": "Nanoscale Stray Fields from Micromagnets for Optimal Spin Qubit Architecture",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:21Z",
  "url": "https://research.draconitic.com/paper/8hbraxfff6njp",
  "venue": "Nano Letters",
  "versions": []
}