Unraveling viscosity effects on the hysteresis losses of magnetic nanocubes

D. Cabrera, A. Lak, T. Yoshida, M. E. Materia, D. Ortega, F. Ludwig, P. Guardia, A. Sathya, T. Pellegrino, F. J. Teran

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Hysteresis losses in magnetic nanoparticles constitute the basis of magnetic hyperthermia for delivering a local thermal stress. Nevertheless, this therapeutic modality is only to be realised through a careful appraisal of the best possible intrinsic and extrinsic conditions to the nanoparticles for which they maximise and preserve their heating capabilities. Low frequency (100 kHz) hysteresis loops accurately probe the dynamical magnetic response of magnetic nanoparticles in a more reliable manner than calorimetry measurements, providing conclusive quantitative data under different experimental conditions. We consider here a set of iron oxide or cobalt ferrite nanocubes of different sizes, through which we experimentally and theoretically study the influence of the viscosity of the medium on the low frequency hysteresis loops of magnetic colloids, and hence their ability to produce and dissipate heat to the surroundings. We analyse the role of nanoparticle size, size distribution, chemical composition, and field intensity in making the magnetisation dynamics sensitive to viscosity. Numerical simulations using the stochastic Landau-Lifshitz-Gilbert equation model the experimental observations in excellent agreement. These results represent an important contribution towards predicting viscosity effects and hence to maximise heat dissipation from magnetic nanoparticles regardless of the environment.

Original languageEnglish
Pages (from-to)5094-5101
Number of pages8
JournalNanoscale
Volume9
Issue number16
DOIs
Publication statusPublished - Apr 28 2017

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Hysteresis
Viscosity
Nanoparticles
Hysteresis loops
Colloids
Calorimetry
Heat losses
Iron oxides
Thermal stress
Ferrite
Cobalt
Magnetization
Heating
Computer simulation
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Cabrera, D., Lak, A., Yoshida, T., Materia, M. E., Ortega, D., Ludwig, F., ... Teran, F. J. (2017). Unraveling viscosity effects on the hysteresis losses of magnetic nanocubes. Nanoscale, 9(16), 5094-5101. https://doi.org/10.1039/c7nr00810d

Unraveling viscosity effects on the hysteresis losses of magnetic nanocubes. / Cabrera, D.; Lak, A.; Yoshida, T.; Materia, M. E.; Ortega, D.; Ludwig, F.; Guardia, P.; Sathya, A.; Pellegrino, T.; Teran, F. J.

In: Nanoscale, Vol. 9, No. 16, 28.04.2017, p. 5094-5101.

Research output: Contribution to journalArticle

Cabrera, D, Lak, A, Yoshida, T, Materia, ME, Ortega, D, Ludwig, F, Guardia, P, Sathya, A, Pellegrino, T & Teran, FJ 2017, 'Unraveling viscosity effects on the hysteresis losses of magnetic nanocubes', Nanoscale, vol. 9, no. 16, pp. 5094-5101. https://doi.org/10.1039/c7nr00810d
Cabrera D, Lak A, Yoshida T, Materia ME, Ortega D, Ludwig F et al. Unraveling viscosity effects on the hysteresis losses of magnetic nanocubes. Nanoscale. 2017 Apr 28;9(16):5094-5101. https://doi.org/10.1039/c7nr00810d
Cabrera, D. ; Lak, A. ; Yoshida, T. ; Materia, M. E. ; Ortega, D. ; Ludwig, F. ; Guardia, P. ; Sathya, A. ; Pellegrino, T. ; Teran, F. J. / Unraveling viscosity effects on the hysteresis losses of magnetic nanocubes. In: Nanoscale. 2017 ; Vol. 9, No. 16. pp. 5094-5101.
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