Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetism Poster B

MA 51.13: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster C

Size-controlled synthesis of hexagonal magnetite nanoparticles — •Ilona Wimmer¹, Bastian Trepka², Sebastian Polarz², and Mikhail Fonin¹ — ¹Department of Physics, University Konstanz, D-78457 Konstanz — ²Department of Chemistry, University Konstanz, D-78457 Konstanz

Magnetic nanoparticles show a variety of unique properties such as superparamagnetism, magnetic single domain states, enhanced magnetic moments and magnetic anisotropies. These phenomena are not found in their bulk counterparts and make magnetic nanoparticles highly interesting for many applications ranging from medicine to data storage. The orientation of the magnetization, the coercivity, the energy barriers which have to be overcome upon reversal and the blocking temperature of nanoparticles are affected by the crystal lattice in connection with the surfaces of nanoparticles.

Here we report on monodisperse magnetite (Fe₃O₄) nanoparticles which were synthesized by means of a solvothermal synthesis and characterized by means of x-ray diffraction and transmission electron microscopy. The particles show a pronounced hexagonal shape with the average particle size of 15 nm. Magnetic measurements reveal superparamagnetic behavior with a blocking temperature of 135 K.