Regensburg 2010 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Poster II
MA 33.9: Poster
Freitag, 26. März 2010, 11:00–14:00, Poster B1
Magnetic field induced changes of the magnetic phase transition in metastable zincblende MnS layers grown by MBE — •Manuel Demper1, Limei Chen1, Christine Bradford2, Hans-Albrecht Krug von Nidda3, Kevin A. Prior2, Alois Loidl3, and Wolfram Heimbrodt1 — 11Department of Physics and Material Science Center, Philipps-University Marburg — 2School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh — 3Center for Electronic Correlation and Magnetism, University Augsburg
The continuous decrease of magnetic structures meets fundamental limits. Hence, it is essential to understand the magnetic interactions in low dimensions. Therefore, we investigated the 3D-2D transition on a series of MBE grown antiferromagnetic zincblende MnS-layers with various thicknesses by using magnetic photoluminescence techniques. The MnS photoluminescence spectra exhibit a strong yellow emission band which belongs to the internal 4T1 → 6A1 transition of the manganese ions in a tetrahedral crystal field. The temperature evolution of this emission reveals a characteristic red-shift towards the Néel-Temperature due to the energy relaxation of the Mn d-states in the antiferromagntic phase. This optical access has been used to study the influence of the 3D-2D transition and the effect of an external magnetic field on the magnetic properties of the MnS layers. Surprisingly, no clear effect was found on the phase transition temperature with decreasing MnS-layer thickness but on increasing external magnetic fields for the thinnest layers. This unique behavior will be discussed in detail.