Berlin 2012 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 9: 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
DF 9.14: Poster
Tuesday, March 27, 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).