Impact of Individual and Collective Anisotropy of Magnetic Nanoparticles on their Heat Generation Ability under High-Frequency Alternating M

We aim to investigate the mechanisms of heat generation in magnetic hyperthermia by analyzing how CoNi nanoparticles (NPs) dissipate energy under an alternating magnetic field (AMF). Our study focuses on two key parameters: collective anisotropy and individual anisotropy of NPs, both of which critically influence frictional heating. To achieve this, CoNi NPs will be embedded in polyethylene glycol (PEG) matrices of varying viscosities to control their dynamics. Using SAXS and XPCS, we will systematically examine (1) collective anisotropy, where pre-aligned NPs form chain-like structures due to strong magnetic interactions, and (2) individual anisotropy, by comparing spherical and dumbbell-shaped NPs to assess the role of shape in energy dissipation. By correlating structural and dynamic measurements with heat generation under AMF, we aim to clarify how these anisotropies impact friction-driven heating, advancing the understanding of magnetic hyperthermia.