{
  "abstract": "We study binary ferrofluids composed of multicore \"nanoflowers\" of magnetically hard CoFe2O4 and magnetically soft MnFe2O4, as a way to optimise heat dissipation while suppressing aggregation-properties essential for biomedical applications. Bulk magnetometry and molecular dynamics simulations were combined to elucidate their behaviour. Experiments show wasp-waisted hysteresis, composition-dependent coercivity, and strong protocol dependence (field cooling). Simulations reproduce these trends and reveal the underlying structure-property coupling: (i) in an applied magnetic field, CoFe2O4 forms chains that dominate collective switching; (ii) adding MnFe2O4 \"poisons\" these chains-shortening and de-branching clusters-thereby lowering coercivity and loop area relative to a weighted superposition of the individual component responses without interactions; (iii) dipolar coupling reciprocally hardens the magnetically soft phase and softens the magnetically hard phase even without large-scale aggregation; and (iv) at higher total volume fraction (ϕ = 0.1) magnetically soft particles still suppress chain growth, reducing mean cluster size by up to an order of magnitude while keeping heating-relevant hysteresis close to Stoner-Wohlfarth expectations. These results establish composition-controlled microstructure as a means to decouple thermal output from aggregation: CoFe2O4 : MnFe2O4 mixtures can be tuned to enhance loss mechanisms while mitigating aggregation, offering a route to binary ferrofluids optimized for magnetic hyperthermia and drug delivery.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 20,
  "authors": [
    {
      "name": "Malika Khelfallah"
    },
    {
      "name": "Ekaterina V Novak"
    },
    {
      "name": "Andrey A Kuznetsov"
    },
    {
      "name": "Deniz Mostarac"
    },
    {
      "name": "Niéli Daffé"
    },
    {
      "name": "Marcin Sikora"
    },
    {
      "name": "Sophie Neveu"
    },
    {
      "name": "Jovana Zečević"
    },
    {
      "name": "Johannes D Meeldijk"
    },
    {
      "name": "Dario Taverna"
    },
    {
      "name": "Philippe Sainctavit"
    },
    {
      "name": "Mauro Rovezzi"
    },
    {
      "name": "Hebatalla Elnaggar"
    },
    {
      "name": "Enzo Bertuit"
    },
    {
      "name": "Nicolas Mille"
    },
    {
      "name": "Rachid Belkhou"
    },
    {
      "name": "Vincent Dupuis"
    },
    {
      "name": "Claire Carvallo"
    },
    {
      "name": "Amélie Juhin"
    },
    {
      "name": "Sofia S Kantorovich"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0y4g45xatr3k4.bib",
  "cited_by": 3,
  "doi": "10.1039/d5nr05218a",
  "fulltext_url": null,
  "id": "0y4g45xatr3k4",
  "issns": [
    "2040-3364",
    "2040-3372"
  ],
  "landing_url": "https://hal.sorbonne-universite.fr/hal-05850566v1",
  "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"
    ],
    [
      "openalex",
      "2204|Characterization and Applications of Magnetic Nanoparticles"
    ]
  ],
  "openalex": "W7134056594",
  "pdf_url": "https://hal.sorbonne-universite.fr/hal-05850566/document",
  "pmcid": null,
  "pmid": "41848751",
  "published": "2026-11-03",
  "publisher": "Royal Society of Chemistry",
  "ris": "https://research.draconitic.com/paper/0y4g45xatr3k4.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T12:20:53Z",
      "native_id": "hal-05850566",
      "source": "hal",
      "url": "https://hal.sorbonne-universite.fr/hal-05850566v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:0.phys",
      "subfield": "general"
    }
  ],
  "title": "Hard meets soft: tuning binary ferrofluids",
  "title_text": "Hard meets soft: tuning binary ferrofluids",
  "type": "peer-reviewed",
  "updated_at": "2026-11-05T12:20:12Z",
  "url": "https://research.draconitic.com/paper/0y4g45xatr3k4",
  "venue": "Nanoscale",
  "versions": []
}