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Positive magnetisation in carbon nanostructures
A.V. Rode,A.G. Christy,N.R. Madsen,E.G. Gamaly,S.T. Hyde,B. Luther-Davies 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Carbon nanoclusters produced by high-repetition-rate laser ablation of glassy carbon in Ar exhibits para- and ferromagnetic behav-iour up to 90 K, showing a narrow hysteresis curve with a coercive forceHc = 420 Oe, remnant magnetisation of 5· 10. 3 emu/g, sus-ceptibility of the order of 10. 5 emu/g Oe and saturation magnetization 0.30.8 emu/g at 1.8 K. We consider briey the mechanism offormation of clusters in the laser-ablated vapour and structural characteristics of the nanoclusters, which show the presence of graph-ite-like sheets with hyperbolic curvature, as proposed for ‘‘schwarzite’’. We postulate that localized unpaired spins occur because of topo-oered by the convoluted sheets.
Characterisation of polycrystalline gallium nitride grown by plasma-assisted evaporation
S. M. Durbin,V. J. Kennedy,S. I. Liem,R. J. Reeves,A. Markwitz,V. A. Christie 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
The remarkable success of GaN-based devices despite comparatively large defect densities has prompted many groups to explorepolycrystalline and amorphous GaN thin lms for various device applications. In this paper we present the results of a series of lmgrowths performed using an RF plasma assisted molecular beam epitaxy system. GaN lms were grown on quartz substrates in thetemperature range of 150650.C, and in all cases were found to be polycrystalline and largelyc-axis oriented. Rutherford back-scattering spectroscopy indicates lms have gallium-rich stoichiometry, except for those grown below 200.C. Bandedge photo-luminescence was observed at room temperature even for the lms grown at 150.C, and many lms exhibited a measurable changein resistivity under exposure to ultraviolet radiation.
MOA-2013-BLG-220Lb: MASSIVE PLANETARY COMPANION TO GALACTIC-DISK HOST
Yee, J. C.,Han, C.,Gould, A.,Skowron, J.,Bond, I. A.,Udalski, A.,Hundertmark, M.,Monard, L. A. G.,Porritt, I.,Nelson, P.,Bozza, V.,Albrow, M. D.,Choi, J.-Y.,Christie, G. W.,DePoy, D. L.,Gaudi, B. S.,H IOP Publishing 2014 The Astrophysical journal Vol.790 No.1
<P>We report the discovery of MOA-2013-BLG-220Lb, which has a super-Jupiter mass ratio q = 3.01 +/- 0.02 x 10(-3) relative to its host. The proper motion, mu = 12.5 +/- 1 mas yr(-1), is one of the highest for microlensing planets yet discovered, implying that it will be possible to separately resolve the host within similar to 7 yr. Two separate lines of evidence imply that the planet and host are in the Galactic disk. The planet could have been detected and characterized purely with follow-up data, which has important implications for microlensing surveys, both current and into the Large Synoptic Survey Telescope (LSST) era.</P>