Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 38: Magnetic Particles / Clusters & Biomagnetism
MA 38.3: Vortrag
Donnerstag, 20. März 2025, 15:45–16:00, H18
Tunable magnetic behavior in [CoFe2O4]n@Pt hybrid nanoparticles — •Joachim Landers1, Moritz Raphael2, Soma Salamon1, Heiko Wende1, and Annette Schmidt2 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen — 2Department of Chemistry, Institute of Physical Chemistry, University of Cologne
[CoFe2O4]n@Pt hybrid nanoparticles were prepared by growing monodisperse CoFe2O4 (CFO) nanocubes epitaxially on the corners of 6 nm cubic Fe/Co-doped Pt seeds. The hybrid particles display a defined configurational order, in which the CFO cubes cover the corner positions, allowing the formation with a variable number n of CFO cubes in reproducible geometries. Thereby, the hybrid particles represent a system of tunable intraparticular magnetic dipolar interaction, acting in superposition to the high cubic magnetocrystalline anisotropy of the CFO nanocubes. This competition creates a complex temperature-dependence of the shape of the magnetic hysteresis curves, dependent on the size and number of attached CFO nanocubes. In the future, this could facilitate the production of high-anisotropy and -magnetization hybrid particles of widely controllable magnetic behavior. To analyze the acting mechanisms and resulting magnetic properties, in-field Mössbauer spectroscopy and different magnetometry protocols were employed. The experimental observations are compared to micromagnetic simulations utilizing MuMax3. Funding by the DFG projects SCHM1747/16-1 and LA5175/1-1 is gratefully acknowledged.
Keywords: magnetic nanoparticles; intraparticle magnetic interaction; hybrid nanomaterials