Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 50: Poster II
MA 50.8: Poster
Freitag, 15. März 2013, 10:30–13:30, Poster D
Magnetic and transport properties of MnSi thin films — •Josefin Engelke1, Niklas van Elten1, Tommy Reimann1,2, Dirk Menzel1, and Stefan Süllow1 — 1Inst. für Physik d. Kond. Materie, TU Braunschweig, Germany — 2Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), TU München, Germany
The ferromagnetic compound MnSi has recently aroused great interest since a variety of different phases is observed in the magnetic phase diagram. Besides a helical spin structure a topologically stable skyrmion phase occurs in a small temperature region close to the ordering temperature. By reducing the dimensionality from bulk to thin films it is expected that the skyrmions are present over a larger temperature regime. Using molecular beam epitaxy we have grown MnSi thin films by simultaneous deposition of Mn and Si. Magnetization and magnetoresistivity measurements have been carried out and related to the magnetic phase diagram. We observe a thickness dependence of the ordering temperature, which can be explained by the reduction of spin-spin interactions in the vicinity of the film surface. In comparison to bulk MnSi critical magnetic fields are enhanced, which is interpreted in terms of the reorientation of the helix affected by the film anisotropy.