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  • 1
    Digitale Medien
    Digitale Medien
    Computer simulation of ultrahigh-density perpendicular magnetic recording : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5664-5666 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The possibility of ultrahigh-density recording higher than 10 Gb/in.2 with perpendicular magnetic recording is investigated by computer simulation for a ring-type head and single-layer medium combination. A nucleation model is used as a media model because it incorporates a nucleation site, which causes irreversible magnetization switching. Fundamental read–write characteristics are found to be entirely different from those of longitudinal recording. Recorded magnetization strongly depends on head field strength; the maximum magnetization appears around the head field strength of media coercivity, and beyond this the recorded magnetization decreases abruptly. Spacing loss in the recording process also depends on head field strength and recording density. However, saturation recording can be attained even at an ultrahigh recording density of 600 kFCI with a spacing of 30 nm. Also, a higher signal-to-noise ratio than in longitudinal recording can be obtained by introducing weak intergrain exchange interaction with a relatively large grain size in the media film. This suggests that perpendicular magnetic recording is stable in thermal fluctuation. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.362209
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  • 2
    Digitale Medien
    Digitale Medien
    Reduction of defects in laser-induced crystallized and amorphized silicon films using plasma hydrogenation (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7377-7383 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Plasma hydrogenation of laser-crystallized and -amorphized films was investigated. The hydrogen concentration was determined to be 1.5 at. % using a method of laser-induced hydrogen effusion for 20-nm-thick crystallized films which were hydrogenated at 250 °C for 30 s. The defect density was reduced from 1×1017 to 4×1016 cm−3. The hydrogen concentration was 2.5 at. % for amorphized films of 12 nm-thickness. This low hydrogen concentration resulted in a low optical band-gap energy of 1.7 eV for amorphized films, while the width of the Urbach tail was 0.06±0.005 eV, which is close to that of hydrogenated amorphous silicon (a-Si:H) films fabricated using radio-frequency glow discharge (rf GD). The defect density of the laser-amorphized silicon films was reduced from 2×1020 to 4×1015 cm−3 eV−1 comparable to a-Si:H films fabricated by rf GD. © 1994 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.357962
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  • 3
    Digitale Medien
    Digitale Medien
    Langmuir-Blodgett Films of 3-Alkylpyrroles Studied by Scanning Tunneling Microscopy (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 3153-3160 
    Details
    ISSN: 1520-5827
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/la00008a047
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  • 4
    Digitale Medien
    Digitale Medien
    Miscibility enhancement via ion-dipole interactions. 1. Polystyrene ionomer/poly(alkylene oxide) systems (1984)
    s.l. : American Chemical Society
    Macromolecules 17 (1984), S. 1335-1340 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00137a008
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  • 5
    Digitale Medien
    Digitale Medien
    Solution properties of ionomers. 2. Simple salt effect (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 754-757 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma00192a040
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  • 6
    Digitale Medien
    Digitale Medien
    Reduction of the source size of gas-puff z-pinch plasmas using an inductive pulsed power system (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 4438-4444 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A small scale inductive pulsed power (IPP) generator with copper wire fuses as an opening switch has been applied to an argon gas-puff z-pinch plasma which can be used as a point source for x-ray lithography. The IPP generator with fuses supplies a driving current of 60 kA in 400 ns to the z-pinch plasma. Without fuses, the generator serves as a conventional fast bank (FB) system which supplies z-pinch current of 60 kA in 4.5 μs. Characteristics of the z-pinch implosions in IPP and FB systems are investigated and compared. The result obtained shows that the intensity of soft x rays emitted from hot spots in both systems is decreased gradually with longer delay time, which is the time difference between energizing a gas-puff actuator and a primary current trigger. Dual axis pinhole imagery shows that the hot spot size is 0.8 mm in diameter in both systems. However, the average radial displacement of hot spots is 0.9 mm in the FB system and it is reduced to 0.4 mm in the IPP system. Optical framing camera images have confirmed that the radial distribution of hot spots is due to kink instability. The framing images also show that the imploding plasma in the FB system which has a pinch size of 2.2 mm in diameter can be further compressed to 1.3 mm. The IPP system can suppress the kink instability of pinch plasma and increases plasma column uniformity along the z axis. This suggests that the IPP system can improve the stability of the pinched plasma so as to minimize the end-on source size for x-ray lithography applications. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1322576
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  • 7
    Digitale Medien
    Digitale Medien
    Effect of grain size, cluster size, and crystallographic orientation upon simulation of longitudinal recording media : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3922-3924 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Simulations of hexagonal magnetic particles with uniform exchange energy and random c-axis in-plane orientation do not reproduce real media magnetic properties. Simulation software was thus modified to model four experimentally observed Co-alloy microstructures, to distinguish the effects of grain size, cluster size, exchange decoupling, and cluster substructure; and to more accurately model real media behavior. Results include: (1) Clusters of isolated uniaxial particles act like single grains having the cluster size. Exchange decoupling on a size scale smaller than the crystallographic grain size has little effect upon hysteresis loops or media noise. (2) The magnetic properties of clustered bicrystal and randomly oriented media depend on the exchange interactions within and between clusters of grains. Media hysteresis loops and recorded tracks are well simulated using exchange energies within randomly oriented or bicrystal grain clusters up to ten times larger than those used in the standard model. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.365073
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  • 8
    Digitale Medien
    Digitale Medien
    Extraction of infrared radiation from SPring-8 : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1543-1546 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Extraction of infrared beams from SPring-8 storage ring is investigated. SPring-8 is a third generation insertion device oriented synchrotron radiation source in x-ray region. It is noticeable, however, that a highly powerful radiation source in infrared region can be obtained from the bending magnet because of the large bending radius of 40 m. In this wavelength region, SPring-8 storage ring has a very sharp natural collimation in the vertical direction and the source size is very small. Extraction of infrared radiation in wavelength of 2–25 μm was designed. Source is a bending magnet and a water-cooled copper mirror is incorporated into the crotch laid just downstream by the bending magnet. The design of crotch and the transport system is carried out.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1143016
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  • 9
    Digitale Medien
    Digitale Medien
    Use of long straight sections of SPring-8 : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 355-358 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The SPring-8 project is in progress in Japan. The main facility is an 8 GeV storage ring dedicated to synchrotron radiation [H. Kamitsubo et al. (this conference)]. The main feature of the ring is in the free straight sections 30 m long. In this paper the design of the long straight sections and how to use them is described. The long free straights are achieved through two phases to make the commissioning of the ring smooth. In the second phase, the long free straight sections are available. These long straight sections have the following potential to realize (1) extremely high brilliance, (2) multiundulators with broadband, and (3) free electron lasers. The emittance of the stored electron beam can be reduced to subnano m rad at 4 GeV with damping wigglers. Three-order higher brilliance can be obtained around 4 keV. With these optics, three-dimensional simulation was performed for free electron lasers (FEL). The calculated gain was not so large in the practical peak current level.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1142754
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  • 10
    Digitale Medien
    Digitale Medien
    Bolometric measurements in JT-60 (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1866-1868 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Radiation losses from the main plasma of the JAERI Tokamak-60 (JT-60) were measured by a 15-channel bolometer array and those from divertor chambers in the ion and electron drift sides were each measured by two bolometers. The bolometric detector consisting of three layers (5-μm-thick gold absorber, 7-μm-thick polyimide foil, and 0.1-μm-thick gold resistor grid) was developed for this measurement. In typical diverted discharges with NB heating, the ratios of power radiated from the main and divertor chambers to the absorbed power were approximately 10% and 20%, respectively. Intense poloidal asymmetries of radiated power localized near the X point outside the torus were observed in diverted discharges. The profiles of the radiated power were reconstructed by an Abel inversion with an asymmetric term. On the other hand, a poloidally asymmetric radiation band localized near the inner wall, "marfe,'' was observed for dense plasmas in limiter discharges with neutral beam heating.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1140090
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