Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 20: Poster I - Biomagnetism, FePt Nanoparticles, Magnetic Particles/Clusters, Magnetic Materials, Magnetic Semiconductors, Half-metals/Oxides, Multiferroics, Topological Insulators, Spin structures/Phase transitions, Electron theory/Computational micromagnetics, Magnetic coupling phenomena/Exchange bias, Spin-dependent transport, Spin injection/spin currents, Magnetization/Demagnetization dynamics, Magnetic measurement techniques

MA 20.14: Poster

Dienstag, 27. März 2012, 12:15–15:15, Poster A

⁵⁷Fe Mössbauer spectroscopy on ferrite nanoparticles — •Mathias Kraken¹, Jochen Litterst¹, Ilka-Marina Grabs², Ingke-Christine Masthoff², Isabel Christina Souza Dinóla³, Julian Andres Munevar Cagigas³, Wiliam Trujillo Herrera³, and Elisa Maria Baggio Saitovitch³ — ¹Institut für Physik der kondensierten Materie | TU Braunschweig | Germany — ²Institut für Partikeltechnik | TU Braunschweig | Germany — ³Centro Brasileiro de Pesquisas Físicas | Rio de Janeiro | Brazil

Due to its specific timescale, Mössbauer spectroscopy is highly suitable to investigate the dynamic properties of magnetic nanoparticles. The hyperfine magnetic spectra between the blocking temperature and very low temperatures may exhibit a broad variety of different shapes.
Accordingly, to describe this rich behaviour a whole range of different, controversially discussed models can be found in literature (1-3).
We performed ⁵⁷Fe Mössbauer measurements on ZnFe₂O₄ nanoparticles, prepared by a non-aqueous sol gel method and characterized by different techniques. The spectra were taken on strongly and weakly interacting particles and the fits to the spectra with the different models are compared in order to gain information about their suitability.

• (1) D.H. Jones et al., J. Magn. Magn. Mater. 78, 320 (1989).
• (2) S. Mørup et al., J. Magn. Magn. Mater. 40, 163 (1983).
• (3) S. Bocquet et al., J. Magn. Magn. Mater. 109, 260 (1992).