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  • 1
    Electronic Resource
    Electronic Resource
    Magnetization reversal process in polycrystalline ordered Fe–Pt(001) thin films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4301-4303 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization reversal processes in Fe–Pt(001) thin films prepared by a high-pressure sputter deposition method were studied. Samples were classified in four types of domain patterns. Type I, with maze-like domain patterns, has a mixing mode of nucleation and wall motion for magnetization reversal. While, type II, with large island domain patterns, shows wall motion in its magnetization reversal. Type III has small island domain patterns, and type IV has fine discrete domain patterns showing rotational modes with inclined M–H loops. Type IV is expected to be one of the candidates for future ultrahigh-density magnetic recording media with high resolution and low noise. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370349
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetic effects on the electron thermal transport in ignition target design (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3420-3424 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Preheating is one of the most critical issues in laser fusion, because of significant reduction of volume compression. The nonlocal heat transport in an ablative plasma is found to play an important role in the preheating under high intensity laser irradiation. Namely, the electron heat transport should be described by the Fokker–Planck (FP) equation in the fluid implosion code. The Spitzer–Härm (SH) thermal conduction model is not applicable because the electron mean free path is comparable to the temperature scale length. The numerical simulations of the implosion with the FP heat transport have been carried out for the fast (high entropy) implosion mode in which the implosion velocity reaches as high as 6×107 cm/s. In the fast implosion, the required laser energy for ignition can be reduced. It is found in the simulation that the isentrope in the FP simulation code is higher by two to four times than that in the flux limited SH simulation. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871592
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  • 3
    Electronic Resource
    Electronic Resource
    Direct-drive hydrodynamic instability experiments on the GEKKO XII laser (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 4079-4089 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hydrodynamic instabilities, such as the Rayleigh–Taylor (R–T) instability, play a critical role in inertial confinement fusion as they finally cause fuel-pusher mixing that potentially quenches thermonuclear ignition. Good understanding of the instabilities is necessary to limit the mixing within a tolerable level. A series of experiments has been conducted on the GEKKO XII laser facility [C. Yamanaka et al., IEEE J. Quantum Electron. QE-17, 1639 (1981)] to measure hydrodynamic instabilities in planar foils directly irradiated by 0.53 μm laser light. It has been found that (1) the imprint is reasonably explained by an imprint model based on the equation of motion with the pressure perturbation smoothed by the cloudy-day effect, and (2) the experimental R–T growth rate is significantly reduced from the classical growth rate due probably to ablative stabilization enhanced by nonlocal heat transport. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872528
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  • 4
    Electronic Resource
    Electronic Resource
    Status of ion sources for the Heavy Ion Medical Accelerator HIMAC : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 962-964 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The Heavy Ion Medical Accelerator in Chiba (HIMAC) at National Institute of Radiological Sciences (NIRS) is the first heavy-ion accelerator complex dedicated to cancer therapy. HIMAC is equipped with two kinds of ion sources. The PIG ion source is an indirectly heated cathode type, which is operated with a very low-duty factor. The ECR ion source has a single closed ECR zone with 10 GHz microwaves. Both sources realize good stability and reproducibility with easy operation, and satisfy the requirements for radiotherapy. They have been successfully used for clinical trials since June of 1994, and several tens of cancer patients have already been treated with 290–400 MeV/u carbon beams. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146784
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  • 5
    Electronic Resource
    Electronic Resource
    Pt resistor thermometry and pressure calibration in a clamped pressure cell with the medium, Daphne 7373 (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2490-2493 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Calibration of a Pt resistance thermometer (Netsushin) in magnetic fields and under pressure in the range of 1.5–300 K and below 1.5 GPa is presented. With the pressure medium, olefin olygomers, Daphne 7373, the pressure is continuous at its solidification and the pressure drop from 300 to 4.2 K by 0.15–0.17 GPa is constant, irrespective of the initial clamped pressure at 300 K. The applicability of the thermometer and the medium for precise study in field and pressure at low temperature is discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148145
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  • 6
    Electronic Resource
    Electronic Resource
    Development of a 500 keV, 22 A D− ion source for the neutral beam injector for JT-60U : Proceedings of the 6th international conference on ion sources (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1018-1020 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The first results of the performance test of the large negative ion source for a JT-60U negative-ion-based neutral beam injector (N-NBI) are presented. The ion source consists of a cesium seeded multicusp plasma generator, where negative ions are produced via volume and surface processes, a 110 cm×45 cm multiaperture extractor, and a three-stage electrostatic accelerator. After negative ion production and voltage holding tests in test stands, the ion source was installed in the N-NBI system and the full power test began. Up to now, the ion source has produced 400 keV, 5.9 A (2.4 MW) D− ion beams, the world highest D− current and beam power, with a pulse duration of 0.1 s. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146743
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of FeSe thin films prepared on GaAs substrate by selenization technique : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5177-5179 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: FeSe thin films were prepared on GaAs(100) substrate by the selenization of Fe films using molecular-beam epitaxy. FeSe compound thin films were obtained at a substrate temperature above 380 °C. From the depth profiles of Fe and Se in the selenized film measured by Auger electron spectroscopy, it was confirmed that an FeSe layer with a constant ratio of Fe/Se was formed. The measured composition ratio of Fe/Se in the film was 1/3. It was different from the composition in Fe3Se4 or Fe7Se8, which is a stable bulk FeSe compound. From the measured M–H curve, it was found that the obtained FeSe film consisted of two phases with different magnetic properties. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365162
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  • 8
    Electronic Resource
    Electronic Resource
    High recording performance of Co–Cr medium sputter-deposited at high Ar pressure and high substrate temperature : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5362-5364 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co–Cr films were prepared by sputter deposition at a high Ar pressure of 70 Pa with elevated substrate temperatures up to 400 °C. Films of 100 nm thickness were deposited using a 19 at. % Cr–Co target onto a well c-axis oriented Ti underlayer prepared on glass disk substrates. The perpendicular coercivity, Hc⊥, of the films increased from 660 to 1940 Oe with increasing temperature. The films with high Hc⊥ exhibited a dense fine microstructure with distinct grain boundaries. The recording performance of the disk samples were measured by using a metal in gap type ring head, comparing with that of conventional Co–Cr films deposited at a low Ar pressure of 0.2 Pa. It was found that the high pressure deposited Co–Cr film exhibited higher output by more than 2 dB at the densities below 320 kFRPI (flux reversals per inch) compared with the conventional film with the same high coercivity. The D50* of as high as 250 kFRPI and the highest recordable density of over 600 kFRPI were confirmed for the new type of Co–Cr film deposited at 70 Pa and at 400 °C. The noise level of the film, however, was slightly higher than that of conventional method films, disagreeing with the suggestion of the microstructure. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361326
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  • 9
    Electronic Resource
    Electronic Resource
    Permeability of microstrip thin films of various materials : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5913-5915 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Soft magnetic bilayered microstrip films have been studied for various materials such as Ni–Fe–Mo–Cu, Co–Zr–Mo–Ni, Fe–Si–N, and Ni–Fe in terms of their magnetization dynamics. Effects of the strip width and the interlayer thickness on permeability were investigated. An optimum interlayer thickness was found for obtaining the maximum permeability for those films except Fe–Si–N, but the optimum value differs in magnetic film material. A scanning Kerr effect microscope observation reveals that permeability variations with strip width related to changes of the dynamic domain configurations of the strips. All magnetic film materials except Fe–Si–N show a high permeability of more than 1000 at 2 μm strip width at each optimum interlayer thickness. When the film width is reduced to 1 μm, however, the permeability decreases significantly regardless of the interlayer thickness and kinds of the film materials. For such narrow strip film, a higher permeability is obtained for higher anisotropy field. It is concluded that the shape anisotropy of the micropatterned films must be controlled for achieving a higher permeability. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362170
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic structure and perpendicular magnetic anisotropy of rare-earth (Nd,Pr,Gd)/Fe multilayers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 365-372 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural phase and the magnetic anisotropy of Nd/Fe, Pr/Fe, and Gd/Fe multilayers have been examined using magnetization measurements and conversion electron Mössbauer spectrometry. With decreasing Fe layer thickness dFe, the structural phase of the Fe layer changes from bcc crystalline to amorphous at the critical thickness dFec of 17–20 A(ring) via an intermediate phase, which contains a paramagnetic phase in the Nd/Fe and Pr/Fe systems, but not in Gd/Fe. At just above dFec, Nd/Fe and Pr/Fe multilayers exhibit perpendicular anisotropy, which originates from the interface anisotropy due to the one ion anisotropy of Nd and Pr. However, Gd/Fe multilayers show in-plane magnetization because of the S-ionic Gd. Below dFec, the magnetization increases from nearly zero with decreasing dFe because of the exchange interaction between Fe and the rare earth (Nd,Pr,Gd). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360839
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