Giant-spin nonlinear response theory of magnetic nanoparticle hyperthermia: a field dependence study
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2017
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Understanding high-field amplitude electromagnetic heat loss phenomena is of great importance, in particular, in the biomedical field, because the heat-delivery treatment plans might rely on analytical models that are only valid at low field amplitudes. Here, we develop a nonlinear response model valid for single-domain nanoparticles of larger particle sizes and higher field amplitudes in comparison to the linear response theory. A nonlinear magnetization expression and a generalized heat loss power equation are obtained and compared with the exact solution of the stochastic Landau-Lifshitz-Gilbert equation assuming the giant-spin hypothesis. The model is valid within the hyperthermia therapeutic window and predicts a shift of optimum particle size and distinct heat loss field amplitude exponents, which is often obtained experimentally using a phenomenological allometric function. Experimental hyperthermia data with distinct ferrite-based nanoparticles and third harmonic magnetization data support the nonlinear model, which also has implications for magnetic particle imaging and magnetic thermometry.
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CARRIĆO, M. S. et al. Giant-spin nonlinear response theory of magnetic nanoparticle hyperthermia: a field dependence study. Journal of Applied Physics, College Park, v. 121, e173901, 2017. DOI: 10.1063/1.4982357. DisponĆvel em: https://pubs.aip.org/aip/jap/article/121/17/173901/947325/Giant-spin-nonlinear-response-theory-of-magnetic. Acesso em: 12 set. 2023.