The relevance of Brownian relaxation as power absorption mechanism in Magnetic Hyperthermia.

ABSTRACT: The Linear Response Theory (LRT) is a widely accepted framework to analyze the power absorption of magnetic nanoparticles for magnetic fluid hyperthermia. Its validity is restricted to low applied fields and/or to highly anisotropic magnetic nanoparticles. Here, we present a systematic experimental analysis and numerical calculations of the specific power absorption for highly anisotropic cobalt ferrite (CoFe₂O₄) magnetic nanoparticles with different average sizes and in different viscous media. The predominance of Brownian relaxation as the origin of the magnetic losses in these particles is established, and the changes of the Specific Power Absorption (SPA) with the viscosity of the carrier liquid are consistent with the LRT approximation. The impact of viscosity on

SUBMITTER: Torres TE 

PROVIDER: S-EPMC6408542 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature