Molecular beam epitaxy of phase pure cubic InN. - In: Applied physics letters, ISSN 1077-3118, Bd. 89 (2006), 26, S. 261903, insges. 3 S.
http://dx.doi.org/10.1063/1.2422913
Exponential distribution of long heart beat intervals during atrial fibrillation and their relevance for white noise behaviour in power spectrum. - In: Journal of biological physics, ISSN 1573-0689, Bd. 32 (2006), 5, S. 383-392
http://dx.doi.org/10.1007/s10867-006-9022-z
Transition to turbulence in magnetohydrodynamic channel flow of liquid metals. - In: NIC Symposium 2006, (2006), S. 341-348
A new type of temperature driven reorientation transition in magnetic thin films. - In: The European physical journal, ISSN 1434-6036, Bd. 53 (2006), 4, S. 463-469
We present a new type of temperature driven spin reorientation transition (SRT) in thin films. It can occur when the lattice and the shape anisotropy favor different easy directions of the magnetization. Due to different temperature dependencies of the two contributions the effective anisotropy may change its sign and thus the direction of the magnetization as a function of temperature may change. Contrary to the well-known reorientation transition caused by competing surface and bulk anisotropy contributions the reorientation that we discuss is also found in film systems with a uniform lattice anisotropy. The results of our theoretical model study may have experimental relevance for film systems with positive lattice anisotropy, as e.g. thin iron films grown on copper.
https://doi.org/10.1140/epjb/e2006-00410-8
Correlation between structural and electrical properties of InN thin films prepared by molecular beam epitaxy. - In: Superlattices and microstructures, ISSN 1096-3677, Bd. 40 (2006), 4/6, S. 289-294
http://dx.doi.org/10.1016/j.spmi.2006.07.006
Strong dispersion of the surface optical phonon of silicon carbide in the near vicinity of the surface Brillouin zone center. - In: Surface science, ISSN 1879-2758, Bd. 600 (2006), 14, S. 2886-2893
The surface optical or FuchsKliewer phonons of the (0 0 1) surface of 3C-SiC and the Si-terminated (0 0 0 1) surfaces of 4H- and 6H-SiC have been investigated with high resolution electron energy loss spectroscopy (HREELS). For each of the SiC polytypes the frequency of the surface optical phonon changes with surface reconstruction, indicating subtle differences in the static polarization at differently reconstructed surfaces. Due to their anisotropy, hexagonal surfaces exhibit a second, much weaker FuchsKliewer mode. For all surfaces under examination, a linear dispersion of the FuchsKliewer mode frequency has been found for wave vectors close to the Gamma-point. This dispersion can be explained by dynamical dipole coupling between atomic oscillators at the surface of the highly polar silicon carbide.
http://dx.doi.org/10.1016/j.susc.2006.05.031
Surface phonons of clean, hydrogen- and deuterium-terminated Si(0 0 1) surfaces. - In: Surface science, ISSN 1879-2758, Bd. 600 (2006), 17, S. 3446-3455
We present a comprehensive vibrational study of the clean and hydrogen- or deuterium-terminated silicon (0 0 1) surface. The modes related to the clean as well as to the H:Si, D:Si, and 2H:Si, 2D:Si surfaces are studied by means of high resolution electron energy loss spectroscopy (HREELS). We pay special attention to the modification of the phonon modes by the surface treatments and compare the data with reported experimental and theoretical results. The analysis of the relative phonon intensities of the clean, mono- and dihydride surfaces yields the assignment of the modes related to the dimer bonds. The isotopic shifts of vibrons related to the SiH and SiD bonds and to the surface phonon are discussed and applied to the characterisation of the surface excitations.
http://dx.doi.org/10.1016/j.susc.2006.06.030
Kinetic growth of nanoclusters with perpendicular magnetic anisotropy. - In: epl, ISSN 1286-4854, Bd. 75 (2006), 1, S. 167-173
The growth of binary-alloy clusters on a weakly interacting substrate through codeposition of two atomic species is studied by kinetic Monte Carlo simulation. Our model describes salient features of CoPt3 nanoclusters, as obtained recently by the molecular-beam epitaxy technique. The clusters display perpendicular magnetic anisotropy (PMA) in a temperature window of growth favorable for applications. This temperature window is found to arise from the interplay of Pt surface segregation and aspect ratio for cluster shapes. Conclusions are drawn on how to optimize growth parameters with respect to PMA.
http://dx.doi.org/10.1209/epl/i2006-10085-9
Origin of n-type conductivity in nominally undoped InN. - In: Materials science and engineering technology, ISSN 1521-4052, Bd. 37 (2006), 11, S. 924-928
http://dx.doi.org/10.1002/mawe.200600082
Einfluss von Prozessen der Bauelementtechnologie auf die Oberflächeneigenschaften und die Biokompatibilität von Gruppe III-Nitrid-basierenden Sensoren :
Impact of device technology processes on the surface properties and biocompatibility of group III nitride based sensors. - In: Materials science and engineering technology, ISSN 1521-4052, Bd. 37 (2006), 11, S. 919-923
http://dx.doi.org/10.1002/mawe.200600078