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  • American Institute of Physics  (36)
  • American Institute of Physics (AIP)  (17)
  • International Union of Crystallography  (5)
  • 2000-2004  (58)
  • 1920-1924
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Year
  • 1
    Electronic Resource
    Electronic Resource
    On the maximum current for a self-focusing relativistic electron beam (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1606-1608 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The maximum possible current has been calculated in a relativistic electron beam-plasma equilibrium. The self-consistent analysis reads Imax〈(m0 c3/e)βbγb, where γb=(1−βb2)−1/2 for the charge-neutralized relativistic beam having a large radius compared with the beam thermal Debye length. The special case found in the literature is reproduced [H. Alfvén, Phys. Rev 55, 425 (1939)]. The present work is essential for relativistic electron transport in fast ignition of targets for laser fusion. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873777
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  • 2
    Electronic Resource
    Electronic Resource
    Two-dimensional particle-in-cell simulation for magnetized transport of ultra-high relativistic currents in plasma (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1302-1308 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nonlinear channel dynamics and magnetized transport of relativistic electron currents in plasma have been investigated, using transverse two-dimensional particle-in-cell simulations allowing for movable ions and fully relativistic binary collisions. Current filaments self-organize in coaxial structures where the relativistic beam in the center is surrounded by magnetized vacuum and a thin return current sheath outside. The current sheath explodes radially. The filament as a whole is current-neutral with almost vanishing magnetic field at the outside. Ion dynamics play an important role, leading to enhanced self-pinching of the filament cores. Collisional effects become significant in the slowly moving return currents. It is shown that electron currents of 100–1000 MA can be transported through dense plasma, but only through a large number of current filaments, each carrying about one Alfvén current. This aspect is essential for relativistic electron transport in fast ignition of targets for inertial confinement fusion (ICF). © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873941
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  • 3
    Electronic Resource
    Electronic Resource
    Writing performance of narrow trackwidth single pole perpendicular heads (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5422-5424 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The writing performance of narrow trackwidth single pole heads was studied on double layer perpendicular media. The main pole of the head was made of high moment Fe–Si–N laminated with Si–N. The narrow poles were made by trimming the wide main pole with an FIB milling system. Saturation recording was achieved by a 0.3 μm trackwidth head for media composed of a Co/Pd or Co–Cr–Nb–Pt recording layer and a Ni–Fe–Nb soft magnetic backlayer. With this head, clear recorded patterns were obtained. It was found that the number of reversed magnetic domains decreased remarkably as the trackwidth was reduced. The MFM images of 0.14 μm trackwidth recording at 400 kFRPI reveals a potential for recording densities exceeding 50 Gbit/in.2 © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373363
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetization measurement on the S=1 quasi-one-dimensional Heisenberg antiferromagnet Ni(C5H14N2)2N3(PF6) (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7338-7340 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed magnetization (M) measurements on the S=1 quasi-one-dimensional Heisenberg antiferromagnet, Ni(C5H14N2)2N3(PF6) (NDMAP) with a vibrating sample magnetometer in a static field (H). In the temperature (T) dependence of the susceptibility (M/H), we observed that a transition from the gapped phase to a gapless one occurs at a finite H. On increasing H further, we observed a bending in the M/H–T curve and the M/H takes almost constant value below the bending temperature (TB). Since TB corresponds to the critical temperature determined from heat capacity measurements, we identify the T independent susceptibility to the perpendicular susceptibility of an anisotropic antiferromagnet. We also observed a change in the M–H curves of NDMAP at finite H. The value of H where M changes corresponds to the phase boundary between the field induced long-range ordered and paramagnetic phases determined from the heat capacity measurement. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1361264
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  • 5
    Electronic Resource
    Electronic Resource
    Electron spin resonance in the S=1 quasi-one-dimensional Heisenberg antiferromagnet Ni(C5H14N2)2N3(PF6) (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5896-5898 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have performed electron spin resonance (ESR) measurements on the S=1 quasi-one-dimensional Heisenberg antiferromagnet, Ni(C5H14N2)2N3(PF6) in the field induced long range ordered (LRO) phase. From the ESR experiments, two branches are observed, one of which is assigned to an antiferromagnetic resonance mode and the other to a one-dimensional excitation that persists in the LRO phase. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372559
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  • 6
    Electronic Resource
    Electronic Resource
    Annealing effects on recording characteristics of CoCr-alloy perpendicular magnetic recording media (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6890-6892 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Annealing effects of CoCrTa and CoCrPt perpendicular magnetic recording media have been investigated. The coercivity and the squareness increase by postannealing when the annealing temperature is higher than 450 °C and CoCr35/TiCr10 dual underlayer is employed. The CoCr35 underlayer suppresses Ti diffusion to the magnetic layer and provides Cr up to the magnetic layer. The signal-to-noise ratio is improved and the magnetization irregularity diameter observed by magnetic force microscopy (MFM) decreases by the postannealing treatment. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372876
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  • 7
    Electronic Resource
    Electronic Resource
    Status of the HIMAC pulsed Penning source : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 972-974 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Since 1994 at the National Institute of Radiological Sciences HIMAC, the NIRS Penning ionized-gauge ion source (PIGIS) has so far been used for radiotherapy with carbon beams and for basic research with several ion species. The source can produce beams from H2 to Fe with a charge-to-mass ratio of between 1/7 and 1/2. It is a hot-cathode type with a filament, of which the lifetime is on the order of a week and the cathode on the order of 1 month, under a low-duty pulsed operation (≤0.5%) synchronized to the ring operation. This PIGIS can produce highly charged ions: for example, 1 e mA of Ar7+ or 500 eμ A of Si5+ ions (by sputtering) under the typical arc power of 5 kW in peak. This article describes the present status of the NIRS-PIGIS. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150362
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  • 8
    Electronic Resource
    Electronic Resource
    Structural characterization of GaN laterally overgrown on a (111)Si substrate (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 955-957 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using transmission electron microscopy, we have characterized defect structures in laterally overgrown GaN crystals, grown directly on SiO2 stripe-patterned (111)Si substrates by metalorganic vapor phase epitaxy using AlGaN as an intermediate layer. The width and the period of the stripe windows were nominally 1 and 2 μm, respectively. The average threading dislocation density for a completely coalesced 2-μm-thick GaN crystal obtained on the [112¯]-oriented stripe-patterned substrate was ∼2×109 cm−2. The reduction in threading dislocation density is a consequence of the lateral growth and dislocation reactions at the coalesced front of the mask. On the other hand, valleys and pits tend to remain on the mask during the growth on the [11¯0]-oriented stripe-patterned substrate. Cracks were present in both crystals. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1394716
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  • 9
    Electronic Resource
    Electronic Resource
    Magneto-optical effects from nanophase α-Fe and Fe3O4 precipitates formed in yttrium-stabilized ZrO2 by ion implantation and annealing (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 711-713 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magneto-optically active nanocomposite structures have been created by using ion implantation and thermal processing to form precipitated layers of ferromagnetic α-Fe or ferrimagnetic Fe3O4 that are embedded in the near-surface region of (100)-oriented yttrium stabilized ZrO2 (YSZ). When Fe-implanted YSZ is annealed at 1100 °C in Ar+4%H2, the redox conditions are sufficiently reducing so that metallic Fe is the stable phase. At lower temperatures the annealing conditions become less reducing and Fe3O4 becomes the stable phase. Transmission electron microscopy and x-ray diffraction studies established that each α-Fe or Fe3O4 particle is a single crystal that is crystallographically aligned with respect to the YSZ host. Magneto-optical effects due to both the α-Fe and Fe3O4 nanophase precipitates were found and characterized using magnetic circular dichroism. These magneto-optical effects have potential applications in integrated-optical devices. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.127094
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  • 10
    Electronic Resource
    Electronic Resource
    Growth of GaN free from cracks on a (111)Si substrate by selective metalorganic vapor-phase epitaxy (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 222-224 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The selective metalorganic vapor-phase epitaxy of wurtzite GaN was performed on a (111) silicon substrate using SiO2 grid mask pattern. Within window regions of (0.2–0.5) mm×(0.2–0.5) mm, GaN films free from cracks were achieved. The full width at half maximum of the (0004) X-ray rocking curve was as narrow as 388 arcs and that of the band edge emission was 18.6 meV at 77 K. The band edge emission peak energy was redshifted. The redshift is reduced slightly in a sample grown on small windows. This suggests that the biaxial strain due to the thermal expansion coefficient mismatch is partly relaxed on small windows. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1432764
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