Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)

MA 18.3: Poster

Dienstag, 26. Februar 2008, 15:15–18:30, Poster E

Probing Magnetic Properties of (Ga,Mn)As by TEM — •Jürgen Gründmayer and Josef Zweck — Universität Regensburg, Germany

(Ga,Mn)As is a typical and highly interesting member of diluted magnetic semiconductors (DMS). These materials may lead to charge and spin sensitive electronics - known as spintronics - in the near future.

While the theoretical mechanism leading to ferromagnetism in (Ga,Mn)As is quite well known nowadays, the micromagnetic structure and behaviour of thin layers, small particles etc. are still to be determined in detail. We want to investigate domain formation, switching characteristics, stray fields and their temperature dependence at a sub micrometer scale which can only be done by transmission electron microscopy.

In order to do so, advanced TEM techniques like Electron Holography and Differential Phase Contrast (DPC) in combination with a field-free Lorentz lens are used and adapted for our material system.

We show first results obtained with our FEI TECNAI F30 microscope and discuss special techniques necessary for treating (Ga,Mn)As in the TEM.