Heat dissipation mechanism of magnetite nanoparticles in magnetic fluid hyperthermia

Makoto Suto, Yasutake Hirota, Hiroaki Mamiya, Asaya Fujita, Ryo Kasuya, Kazuyuki Tohji, Balachandran Jeyadevan

Research output: Contribution to journalArticlepeer-review

135 Citations (Scopus)


The relative contributions of Néel and Brownian relaxations on magnetic heat dissipation were studied by investigating the physical, magnetic and heating characteristics of magnetite nanoparticle suspensions with average diameters of 12.5 and 15.7 nm. Heating characteristics depended on the dispersion states of particles. The specific absorption rates (SAR) dropped by 27% for the 12.5 nm particles to 16.8×10-9 W g-1 Oe-2 Hz-1 and by 67% for the 15.7 nm particles to 9.69×10-9 W g-1 Oe-2 Hz-1, when the particle rotation was suppressed by dispersing magnetite nanoparticles in hydro-gel.

Original languageEnglish
Pages (from-to)1493-1496
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Issue number10
Publication statusPublished - 2009 May
Externally publishedYes


  • Brown relaxation
  • Heat dissipation
  • Magnetic fluid
  • Magnetite
  • Néel relaxation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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