Dresden 2006 – scientific programme

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.25: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Growth and characterisation of Fe thin films on GaN(0001) — •Stephen Krzyk¹, Mikhail Fonin¹, Reza Ghadimi², Ralph Meijers³, Gernot Güntherodt², and Ulrich Rüdiger¹ — ¹Fachbereich Physik, Universität Konstanz, 78457 — ²II. Physikalisches Institut, RWTH Aachen, 52056 Aachen, Germany — ³Institute of Thin Films and Interfaces (ISG1), cni - Center of Nanoelectronic Systems for Information Technology, Research Centre Jülich, 52425 Jülich, Germany

We report growth studies of Fe on wurtzite GaN(0001) with respect to structural and magnetic properties. The growth of Fe has been carried out by molecular beam epitaxy (MBE) in ultra high vacuum (UHV). The Fe films were studied by a number of characterization techniques such as low-energy electron diffraction (LEED), reflection high energy electron diffraction (RHEED), X-ray diffraction (XRD), scanning tunneling microscopy (STM) and superconducting quantum interference device SQUID magnetometry. Despite the large lattice mismatch between Fe and wurtzite GaN epitaxial growth of Fe(110) was achieved. A strong dependence of the crystalline structure of the Fe films on the annealing parameters of the GaN substrates and the thickness of the grown films was observed. SQUID measurements showed ferromagnetic behaviour of the Fe films up to room temperature.