Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.20: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Preparation, Capping and Characterization of Gd doped EuO Thin Films — •T. Haupricht1, R. Sutarto1, H. Ott1, N. Hollmann1, H. Hartmann1, T. Lorenz1, Z. Hu1, C. F. Chang1, H. H. Hsieh2, H. J. Lin3, C. T. Chen3, P. Nagel4, S. Schuppler4, and L. H. Tjeng1 — 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany — 2Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan — 3NSRRC, 101 Hsin-Ann Road, Hsinchu 30076, Taiwan — 4ANKA, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
EuO belongs to the rare class of ferromagnetic semiconductors. By electron doping the Curie temperature (TC) of 69 K for stoichiometric bulk EuO can be enhanced up to 160 K [1].
We report on the growth and characterization of Gd doped EuO thin films. We prepared samples by means of MBE under distillation conditions, which allows a very precise control of the oxygen stoichiometry. Using LEED and RHEED we show that the EuO films can be grown epitaxially and that the [100] directions of the films and MgO substrates are aligned. In order to perform ex-situ measurements we covered the samples with Au and Al capping layers. Using Vibrating Sample Magnetometry we investigated the dependence of TC on Gd doping and O deficiency. We have observed record high TC’s of 170 K for a Gd concentration of about 4% [2].
[1] A. Mauger and C. Godart, Phys. Rep. 141, 51 (1986)
[2] H. Ott et al., Phys. Rev. B 73, 094407 (2006)