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When magnetic nanoparticles (MNPs) are single-domain and magneticallyindependent, their magnetic properties and the conditions to optimize theirefficiency in magnetic hyperthermia applications are now well-understood.However, the influence of magnetic interactions on magnetic hyperthermiaproperties is still unclear. Here, we report hyperthermia and high-frequencyhysteresis loop measurements on a model system consisting of MNPs with the samesize but a varying anisotropy, which is an interesting way to tune the relativestrength of magnetic interactions. A clear correlation between the MNPanisotropy and the squareness of their hysteresis loop in colloidal solution isobserved : the larger the anisotropy, the smaller the squareness. Since lowanisotropy MNPs display a squareness higher than the one of magneticallyindependent nanoparticles, magnetic interactions enhance their heating power inthis case. Hysteresis loop calculations of independent and coupled MNPs arecompared to experimental results. It is shown that the observed features are anatural consequence of the formation of chains and columns of MNPs duringhyperthermia experiments: in these structures, when the MNP magnetocristallineanisotropy is small enough to be dominated by magnetic interactions, thehysteresis loop shape tends to be rectangular, which enhance their efficiency.On the contrary, when MNPs do not form chains and columns, magneticinteractions reduces the hysteresis loop squareness and the efficiency of MNPscompared to independent ones. The present work should improve the understandingand interpretation of magnetic hyperthermia experiments.

physical review. b, condensed matter and materials physics

Increase of magnetic hyperthermia efficiency due to dipolar interactions  in low anisotropy magnetic nanoparticles : theoretical and experimental  results