Hyperthermic effects of dissipative structures of magnetic nanoparticles in large alternating magnetic fields.

{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "alternating magnetic field (magnetic hyperthermia context)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "magnetic loss (relaxation loss, hysteresis loss)",
    "heat dissipation mechanisms in magnetic nanoparticles",
    "formation of dissipative structures under high-frequency axial field"
  ],
  "main_findings": "Numerical comparisons suggested that rotatable superparamagnetic nanoparticles can show a secondary maximum in relaxation loss in large alternating magnetic fields due to slow rotation of the magnetic easy axis, in addition to a primary maximum attributed to Néel relaxation. For rotatable ferromagnetic nanoparticles, irradiation with a high-frequency axial field generated longitudinal or planar oriented structures, which significantly affected conditions for maximum hysteresis loss.",
  "effect_direction": "unclear",
  "limitations": [
    "Study described as numerical comparison/modeling; no experimental or clinical outcomes reported in the abstract.",
    "Exposure parameters (field strength, frequency) are not specified in the abstract.",
    "No biological endpoints or safety/health outcomes are reported; focus is on physical mechanisms relevant to hyperthermia design."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "magnetic nanoparticles",
    "magnetic hyperthermia",
    "alternating magnetic field",
    "Néel relaxation",
    "hysteresis loss",
    "dissipative structures",
    "ferromagnetic nanoparticles",
    "superparamagnetic nanoparticles",
    "numerical study"
  ],
  "suggested_hubs": [
    {
      "slug": "engineering",
      "weight": 0.6,
      "reason": "Mechanistic/numerical study of magnetic nanoparticle heating in alternating magnetic fields for hyperthermia."
    },
    {
      "slug": "medical-applications",
      "weight": 0.55,
      "reason": "Discusses design implications for targeted magnetic hyperthermia cancer treatment."
    }
  ]
}