Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 36: Magnetic Measurement Techniques

MA 36.1: Hauptvortrag

Donnerstag, 14. März 2013, 09:30–10:00, H3

Towards single Nanoparticle detection: Element Specific Ferromagnetic Resonance - Microresonators in ScanningTransmission X-ray Microscopy — •Katharina Ollefs — ESRF, Grenoble, France

Magnetic nanoparticles find manifold applications from biomedicine over magnetic sensors to storage devices. For these applications the static but also the dynamic properties are important as for example the magnetic anisotropy energy is a key parameter determining the magnetic hardness and with that the thermal and temporal stability of the individual nanoparticle. These properties vary from particle to particle, for example, due to surface effects resulting from slightly different morphologies [1]. X-ray detected ferromagnetic resonance (XFMR), a combination of ferromagnetic resonance (FMR) and x-ray absorption spectroscopy (XAS) offers the unique possibility to study the static and dynamic spin and orbital magnetic moments and the magnetocrystalline anisotropy with elemental specificity. In this work XFMR is pursued combining the local resolution of a transmission x-ray microscope [2] with microresonators. These microresonators allow to measure FMR on nanosized objects by enhancing the filling-factor and therefore pave the way for XFMR measurements of nanoparticles.

This work is done in collaboration with A. Ney, R. Meckenstock, D. Spoddig, Ch. Schöppner, H. Ohldag and M. Farle.

[1] F. Kronast, N. Friedenberger, K. Ollefs, et al., Nano Lett. 11, 1710 (2011) [2] D. Zhu, et.al; Phys. Rev. Lett. 105, 043901 (2010)