Dresden 2026 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Complex Fluids and Soft Matter (joint session DY/CPP)

CPP 20.7: Vortrag

Dienstag, 10. März 2026, 11:15–11:30, ZEU/0160

Linking molecular dynamics and experimental FORCs in multicore magnetic nanoparticles — Ekaterina Novak¹, •Malika Khelfallah², Andrey Kuznetsov³, Deniz Mostarac⁴, Claire Carvallo², Amélie Juhin², and Sofia Kantorovich³ — ¹Ekaterinburg, Russia — ²Sorbonne Université, Paris, France — ³University of Vienna, Vienna, Austria — ⁴University of Edinburgh, Edinburgh, United Kingdom

Multicore magnetic nanoparticles - clusters of several magnetic grains embedded in a nonmagnetic matrix - exhibit collective behaviour distinct from single-core particles and are promising candidates fro drug targeting and magnetic hyperthermia. Their magnetic cores possess finite anisotropy, and the multicore assemblies range from near-spherical to elongated ellipsoids, features that strongly affect their response to external fields. To study these effects, we use molecular dynamics simulations [1] to model internal structure, anisotropy distribution, and collective switching. As a key diagnostic, we employ First Order Reversal Curves [2], which experimentalists routinely measure for immobilised multicore particles, enabling direct comparison between simulations and experiments. FORC diagrams reveal coercivity distributions and magnetic interactions between grains, offering detailed insight into interaction mechanisms and domain processes.

The work was financially supported by the RSF grant No. 25-22-00762.

[1] R. Weeber et al. (2024), Comprehensive Computational Chemistry, 3, 578-601. [2] C. R. Pike et al., J. Appl. Phys., 1999, 85, 6660

Keywords: molecular dynamics; multicore particles; FORK