Volume 99, Issue 1, 01 January 2006
Index of content:
99(2006); http://dx.doi.org/10.1063/1.2158127View Description Hide Description
The transient response during resistance switching in thin films is investigated by measurements using pulsed voltage biases. Semiconducting (PCMO) films sandwiched by Ag and Pt electrodes show nonvolatile resistance switching (two orders of magnitude) as a result of applying pulsed voltage biases, even at room temperature. The transient responses of the voltage across the PCMO for a set (positive) and a reset (negative) pulse application are consistent with the resistance-switching behavior and show quite fast switching (3–100 ns) for the set pulse application, compared with 60–135 ns for the reset pulse application. The large resistance-switching ratio is saturated after a finite transient time, indicating that the carrier filling of the trap sites into PCMO is completed within quite a short time.
99(2006); http://dx.doi.org/10.1063/1.2158129View Description Hide Description
multilayers were prepared on 100 °C MgO (100) single-crystal substrates with magnetron sputtering. The ordering and perpendicular texture of particle films with high coercive force were realized at a lower postannealing temperature and by controlling accurately the atomic ratio of Fe to Pt of films. The results of the x-ray-diffraction pattern show that the FePt particles have excellent (001) texture when the multilayers were sputtered on 100 °C substrates with the thickness of the Ag layer , and the mean size of particles reduces with increasing thickness of the Ag layer. After the was vacuum annealed at 600 °C for 15 min, the mean size of particles is roughly about 8 nm and its perpendicular coercive force reaches . This particle film has little magnetic exchange coupling and is a candidate for future perpendicular magnetic recording media with ultrahigh density.
99(2006); http://dx.doi.org/10.1063/1.2158128View Description Hide Description
We report the demonstration of polymer-based top-emitting diodes that employed environmentally stable cathode materials. The device employed an emissive polymer blend that we reported previously [Deng et al.Appl. Phys. Lett.84, 3522 (2004)]. By constructing a semitransparent cathode using the stable metals Al and Ag, bright light emission through the top cathode was achieved. An index-matching overlayer deposited by spin coating was shown to enhance the transmission efficiency through the top electrode.Microcavity effects were observed for the device by replacing the indium tin oxide anode with Au, resulting in wavelength tunability of the device.
99(2006); http://dx.doi.org/10.1063/1.2160707View Description Hide Description
Spin vortex is a very common structure in ferromagneticthin films, but it can be easily shifted by an in-plane applied field. The paper demonstrates that the vortex can be positioned over certain regions of the film due to the position of the hole made in the thin film. The calculation clearly shows that the hole can stabilize the spin vortex and sharpen the loop transition, and may have potential applications in nanomagnets.
Slab-thickness dependence of polarization change of terahertz waves transmitted through metal hole arrays99(2006); http://dx.doi.org/10.1063/1.2158490View Description Hide Description
Polarizationcharacteristics of the terahertz wave transmitted through metal hole arrays with the triangular lattice structure are investigated in the subterahertz region. The metal hole arrays used in our experiments are thin metal slabs perforated periodically with circular holes. The polarization rotation of the terahertz wave transmitted through the metal hole arrays occurs only in the spectral range of the resonant frequency of the surface waves. By investigating the dependence of this phenomenon on the thickness of the metal hole array, we attribute such polarization phenomenon to the resonant excitation of the surface waves.