Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Poster I
MA 16.76: Poster
Dienstag, 12. März 2013, 10:30–13:30, Poster D
Quantitative MFM on a BaFe2(As0.24P0.76)2 single crystal — •Fabian Rhein1, Silvia Vock1, Henry Stopfel1, Ulrike Wolff1, Volker Neu1, Dmytro S. Inosov2, Yong Liu2, Chengtian Lin2, Hans J. Hug3, Niraj Joshi3, Sevil Özer3 und Ludwig Schultz1 — 1IFW Dresden, Institute for Metallic Materials, P.O. BOX 270116, 01171 Dresden, Germany — 2Max Planck Institute for Solid State Research,Heisenbergstraße 1, 70569 Stuttgart, Germany — 3Institute of Physics, University Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
The discovery of iron based superconductors (SC) in 2008, motivated the intensive investigation of characteristic properties of differently doped single crystals. In particular, the analysis of the temperature dependent magnetic penetration depth λ(T) and the properties of the vortex arrangement are important parameters to characterize a SC.
Quantitative magnetic force microscopy (MFM) enables the determination of these quantities. The measured MFM signal is a convolution between the stray field of a magnetic flux line and the magnetization of the tip. To be able to extract λ(T) from the measured data different methods exists. We show, that the commonly used monopole-monopole model[1,2] can be replaced by a more convenient tip calibration procedure[3] and a more realistic description of the magnetic flux line‘s stray field.
Furthermore we extracted the vortex arrangement by statistical evaluation methods.