Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.72: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster C
Antiferromagnetically coupled half-shell magnetite nanoparticles with tuneable magnetic remanence — •Patrick Steinkraus1, Inci Nur-Sahin1, Veronica Salguerino2, Ecem Tiryak2, Marina Spasova1, and Michael Farle1 — 1Faculty of Physics and Center of Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, 47057 Germany — 2Departamento de Física Aplicada and CINBIO, Universidade de Vigo, 36310 Vigo, Spain
Magnetite nano-hybrids were chemically synthesized in the form of two magnetite half-shells with a length of 460 nm and width of 90 nm covered with a 30 nm thick silicon dioxide layer. Structure, chemical composition, and morphology were characterized using Transmission Electron Microscopy, Energy Dispersive X-Ray Spectroscopy and Electron Energy Loss Spectroscopy. The magnetic hysteresis of individual particles was simulated using data from our structural and morphological analysis. In the absence of magnetic field, the composite particle acts like an antiferromagnet. However, when exposed to an external magnetic field of B = 75mT, the magnetizations of the two half-shells align ferromagnetically. Below B = -34mT, the magnetizations revert to their antiparallel alignment. The 30 nm thick silica shell suppresses the dipole-dipole interaction between particles preventing their agglomeration. These properties may make these nanoparticles perfect candidates for magneto-mechanical and hyperthermia therapies. Funding by the European Union's Horizon 2020, project No 857502 (MaNaCa) is gratefully acknowledged.
Keywords: Synthetic antiferromagnet; Nanoparticle; magneto-mechanical; Magnetite; hyperthermia