Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Magnetic Thin Films II
MA 23.13: Vortrag
Mittwoch, 25. März 2009, 17:45–18:00, HSZ 04
Growth and magnetic properties of epitaxial Gd-doped EuO thin films on YSZ (001) — •Simone G. Altendorf1, Ronny Sutarto1, Beatrice Coloru1, Marco Moretti Sala1, Tim Haupricht1, Chun Fu Chang1, Zhiwei Hu1, Christian Schüßler-Langeheine1, Nils Hollman1, Harald Kierspel1, Hui-Huang Hsieh2, Hong-Ji Lin3, Chien-Te Chen3, and Liu Hao Tjeng1 — 1II. Physikalisches Institut, Universität zu Köln, Zülplicher Str. 77, 50937 Köln, Germany — 2Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan — 3National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30077, Taiwan
We have been able to prepare high quality single-crystalline Gd-doped EuO thin films with well defined Gd concentrations. Using Eu-distillation assisted molecular beam epitaxy (MBE) and a systematic variation of the Gd and oxygen deposition rates, we have observed layer-by-layer epitaxial growth on yttria stabilized cubic zirconia (YSZ) (001). The RHEED and LEED patterns are extremely crisp. Soft x-ray absorption spectroscopy (XAS) at the Eu M4,5 edges confirm that the films are completely free from Eu3+ contaminants. The true Gd concentration has been determined using XAS at the Gd M4,5 edges. This concentration could significantly deviate from the nominal Gd/Eu evaporation ratio, consistent with the distillation process during growth. We also found that the Curie temperature TC increases continuously up to 135 K with the Gd concentration, in agreement with most recent theoretical predictions.