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  • 1. Kim, Y B
    et al.
    Olin, Håkan
    Department of Physics, Chalmers University of Technology.
    Park, S Y
    Choi, J W
    Komitov, L
    Matuszczyk, M
    Lagerwall, S T
    Rubbed polyimide films studied by scanning force microscopy1995In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 66, p. 2218-2219Article in journal (Refereed)
    Abstract [en]

    The surfaces of rubbed polyimide films for aligning liquid crystal have been studied by atomic force microscopy. The unrubbed films consisted of randomly distributed polyimide clusters of different sizes. On the rubbed surface, however, the clusters are aligned in long chains along the rubbing direction. The cluster chains were separated by about 100 nm for small rubbing strength. For higher strength the cluster chains coalesced into wider ones.

  • 2. Kukushkin, I V
    et al.
    Mikhailov, Sergey A
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Smet, J H
    Miniature quantum-well microwave spectrometer operating at liquid-nitrogen temperatures2005In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 86, no 4, p. 044101-Article in journal (Refereed)
    Abstract [en]

    We demonstrate that a two-dimensional electron system fabricated from a GaAs/AlGaAs quantum well in the presence of a magnetic field B possesses the ability to detect electromagnetic radiation in a broad frequency range. Irradiation of the sample with microwaves produces a dc-photovoltage which oscillates as a function of B. The amplitude and the period of the oscillations are proportional to the radiation power and the wavelength, respectively. Successful operation of such a detector/spectrometer is reported for microwave frequencies up to similar to150 GHz and temperatures up to similar to80 K. We do not anticipate any principal difficulties in extending the operation frequency further into the terahertz region.

  • 3.
    Mikhailov, Sergey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Propagation of edge magnetoplasmons in semiconductor quantum-well structures2006In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 89, no 4, article id 042109Article in journal (Refereed)
    Abstract [en]

    The wavelength and the propagation length of the edge magnetoplasmons, running along the edge of a two-dimensional electron layer in a semiconductor quantum-well structure, are theoretically studied as a function of frequency, magnetic field, electron density, mobility, and geometry of the structure. The results are intended to be used for analysis and optimization of operation of recently invented quantum-well microwave spectrometers operating at liquid-nitrogen temperatures [I. V. Kukushkin , Appl. Phys. Lett. 86, 044101 (2005)].

  • 4. Neuber, G.
    et al.
    Rauer, R.
    Kunze, J.
    Korn, T.
    Pels, C.
    Meier, G.
    Merkt, U.
    Bäckström, Joakim
    Rubhausen, M.
    Temperature-dependent spectral generalized magneto-optical ellipsometry2003In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 83, p. 4509-4511Article in journal (Refereed)
    Abstract [en]

    We present a setup for temperature-dependent spectral generalized magneto-optical ellipsometry (SGME). This technique gives access to the electronic as well as the magnetic properties of ferromagnetic materials within one single magneto-optical measurement. It also allows the determination of the orientation of the magnetization. We show spectra of the real and the imaginary part of the refractive index N as well as the magneto-optical coupling parameter Q of permalloy and iron films for in-plane magnetization. Our findings demonstrate the relevance of SGME for the understanding of the interplay between electronic and magnetic properties of ferromagnetics. (C) 2003 American Institute of Physics.

  • 5. Rauer, R.
    et al.
    Bäckström, Joakim
    Budelmann, D.
    Kurfiss, M.
    Schilling, M.
    Rubhausen, M.
    Walter, T.
    Dorr, K.
    Cooper, S. L.
    Thickness dependent phase separation in La0.7Ca0.3MnO3 films2002In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 81, p. 3777-3779Article in journal (Refereed)
    Abstract [en]

    The complex dielectric function of La0.7Ca0.3MnO3 films with various thicknesses and on different substrates was determined by the analysis of measured ellipsometric parameters. The temperature-dependent redistribution of low-energy spectral weight shows that the metallicity is developed gradually below an onset temperature that is found to depend strongly on global and local strain properties, not on film thickness alone. Importantly, the 2 nm film shows no metallic conduction but an optical charge-carrier response below 240 K. This suggests that ultrathin films are characterized by phase separation and a percolation-type transition. (C) 2002 American Institute of Physics.

  • 6. Yi, H R
    et al.
    Ivanov, Z G
    Winkler, D
    Zhang, Y M
    Olin, Håkan
    Larsson, P
    Claeson, T
    Improved step edges on LaAlO3 substrates by using amorphous carbon etch masks1994In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 65, p. 1177-1179Article in journal (Refereed)
    Abstract [en]

    We report a technique for the fabrication of sharp and straight step edges on LaAlO3 (LAO) substrates by ion milling. An electron beam lithography defined amorphous carbon film was used as an etch mask. It had very low ion milling rate and was easily prepared and removed. Atomic force microscopy was used to determine the step profile. YBa2Cu3O7 step edge junctions fabricated at the LAO steps show promising results. An IcRn product of 1 mV was obtained at 30 K. A Fraunhofer-like magnetic field dependence of Ic was obtained up to ±2 0. One weak link or possibly identical weak links in series for these step edge junctions were observed from the current-voltage (I-V) curves as well as from the magnetic field dependence of the I-V curves. Applied Physics Letters is copyrighted by The American Institute of Physics.

     

  • 7. Ziegler, K.J.
    et al.
    Lyons, D.M.
    Holmes, J.D.
    Erts, D.
    Polyakov, B.
    Olin, Håkan
    Chalmers University of Technology.
    Svensson, K.
    Olsson, E.
    Bistable nanoelectromechanical devices2004In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 84, no 20, p. 4074-4076Article in journal (Refereed)
    Abstract [en]

    A combined transmission electron microscopy-scanning tunneling microscopy (TEM-STM) technique has been used to investigate the force interactions of silicon and germanium nanowires with gold electrodes. The I(V) data obtained typically show linear behavior between the gold electrode and silicon nanowires at all contact points, whereas the linearity of I(V) curves obtained for germanium nanowires were dependent on the point of contact. Bistable silicon and germanium nanowire-based nanoelectromechanical programmable read-only memory (NEMPROM) devices were demonstrated by TEM-STM. These nonvolatile NEMPROM devices have switching potentials as low as 1 V and are highly stable making them ideal candidates for low-leakage electronic devices.

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