Size dependence of the magnetic relaxation and specific power absorption in iron oxide nanoparticles

  • E. LimaJr.
  • T. E. Torres
  • L. M. Rossi
  • H. R. Rechenberg
  • T. S. Berquo
  • A. Ibarra
  • C. Marquina
  • M. R. Ibarra
  • G. F. GoyaEmail author
Research Paper


In this study, magnetic and power absorption properties of a series of iron oxide nanoparticles with average sizes 〈d〉 ranging from 3 to 23 nm were reported. The nanoparticles were prepared by thermal decomposition of Iron(III) acetylacetonate in organic media. From the careful characterization of the magnetic and physicochemical properties of these samples, the specific power absorption (SPA) values experimentally found were numerically reproduced, as well as their dependence with particle size, using a simple model of Brownian and Néel relaxation at room temperature. SPA experiments in ac magnetic fields (H 0 = 13 kA/m and f = 250 kHz) indicated that the magnetic and rheological properties played a crucial role determining the heating efficiency at different conditions. A maximum SPA value of 344 W/g was obtained for a sample containing nanoparticles with 〈d〉  = 12 nm and dispersion σ = 0.25. The observed SPA dependence with particle diameter and their magnetic parameters indicated that, for the size range and experimental conditions of f and H studied in this study, both Néel and Brown relaxation mechanisms are important to the heat generation observed.


Magnetic nanoparticles Magnetic losses Superparamagnetism Electromagnetic heating 



This study was supported partially from Diputación General de Aragon (DGA) and Ministerio de Economia y Competitividad (MINECO, Project MAT2010-19326), Spain. Partial support from the Brazilian agency FAPESP is also acknowledged. E. Lima Jr. acknowledges financial support from the FAPESP through a postdoctoral fellowship.

Conflict of interest

The authors declare that they do not have any affiliations that would lead to a conflict of interest.

Supplementary material

11051_2013_1654_MOESM1_ESM.jpg (124 kb)
In-phase (χ′) and out-of-phase (χ″) components of the ac magnetic susceptibility as function of temperature measured at different frequencies of samples C04, C05, and C06 as representative of the systems CYY. Supplementary material 1 (JPEG 124 kb)
11051_2013_1654_MOESM2_ESM.jpg (146 kb)
Time dependence of the temperature (T vs. t) for a Fe3O4 NPs of samples APXX and GEXX, and b for samples CYY in ac magnetic field with H 0 = 200 Oe and f = 250 kHz. Supplementary material 1 (JPEG 145 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • E. LimaJr.
    • 1
  • T. E. Torres
    • 2
  • L. M. Rossi
    • 3
  • H. R. Rechenberg
    • 4
  • T. S. Berquo
    • 5
  • A. Ibarra
    • 6
  • C. Marquina
    • 7
  • M. R. Ibarra
    • 8
  • G. F. Goya
    • 9
    Email author
  1. 1.CONICET & Instituto de Nanociencia y Nanotecnologia & Centro Atómico BarilocheS. C. BarilocheArgentina
  2. 2.Instituto de Nanociencia de Aragón (INA) & Departamento de Física de la Materia Condensada & Laboratorio de Microscopias Avanzadas (LMA)University of ZaragozaZaragozaSpain
  3. 3.Instituto de Química, Universidade de São PauloSão PauloBrazil
  4. 4.Instituto de Física, Universidade de São PauloSão PauloBrazil
  5. 5.Institute of Rock Magnetism, University of MinnesotaMinneapolisUSA
  6. 6.INA & LMAUniversity of ZaragozaZaragozaSpain
  7. 7.Departamento de Física de la Materia Condensada & Instituto de Ciencia de Materiales de Aragón (ICMA)CSIC, Universidad de ZaragozaZaragozaSpain
  8. 8.INA & Departamento de Física de la Materia Condensada & LMAUniversity of ZaragozaZaragozaSpain
  9. 9.INA & Departamento de Física de la Materia CondensadaUniversity of ZaragozaZaragozaSpain

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