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  • 2000-2004  (562)
  • 1965-1969  (86)
  • 1930-1934
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  • 1
    Series available for loan
    Series available for loan
    Radiation fluxes over an Antarctic ice surface, Mawson, 1961-62 (1967)
    Melbourne : Antarctic Division, Dept. of External Affairs
    Associated volumes
    Details Availability
    Call number: AWI G7-90-0029
    In: ANARE scientific reports
    Type of Medium: Series available for loan
    Pages: 106 S. : Ill.
    Series Statement: ANARE scientific reports : Series A (IV), Glaciology 96
    Branch Library: AWI Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Ferroelectricity : Proceedings of the Symposium on Ferroelectricity, General Motors Research Laboratories, Warren, Michigan, 1966 (1967)
    Amsterdam [u.a.] : Elsevier
    Details Availability
    Call number: 7219
    Type of Medium: Monograph available for loan
    Pages: 318 S. : Ill.
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 3
    Electronic Resource
    Electronic Resource
    Growth, structural, and magnetic properties of high coercivity Co/Pt multilayers (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7525-7527 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron beam evaporated Co/Pt multilayers {[Co(tCo nm)/Pt(1 nm)]10, 0.2〈tCo〈2 nm} with perpendicular magnetic anisotropy and room temperature coercivities Hc=2–15 kOe are studied as a function of growth temperature TG. Hysteresis loops and magnetic force microscopy (MFM) indicate changes in the magnetization reversal mechanism along with a sharp increase in coercivity for TG(approximately-greater-than)230–250 °C. Films grown at TG〈230 °C (tCo=0.2–0.4 nm) show micrometer size magnetic domains and rectangular hysteresis indicating magnetization reversal dominated by rapid domain wall motion following nucleation at Hn∼Hc. Films grown at TG〉250 °C show fine-grained MFM features on the sub-100-nm length scale indicating reversal dominated by localized switching of small clusters. High-resolution cross-sectional transmission electron microscopy (TEM) with elemental analysis shows columnar grains extending throughout the multilayer stack. Co depletion and structural defects at the grain boundaries provide a mechanism for exchange decoupling of adjacent grains, which may result in the high coercivities observed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1363602
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  • 4
    Electronic Resource
    Electronic Resource
    Survey of magnetohydrodynamic instabilities in the advanced stellarator Wendelstein 7-AS (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 931-956 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetohydrodynamic (MHD) instabilities in the Wendelstein 7-AS stellarator (W7-AS) [G. Grieger et al., Phys. Fluids B 4, 2081 (1992)] are characterized experimentally in various plasma parameter regimes and heating scenarios. The observations are compared with theoretical predictions for particular cases. In the high-β range (〈β〉≤2%) no clear evidence of a stability β-limit could be found yet. In the lower β regime fast particle driven global Alfvén modes are the most important instabilities during neutral beam injection (NBI). Besides of coherent modes with almost no effect on the plasma performance additional Alfvén modes appear at higher frequencies up to 400 kHz, which show nonlinear phenomena-like bursting, frequency chirping, and MHD induced energy and fast particle losses. The activity of edge localized modes (ELMs) is investigated in NBI heated discharges. The issue of current driven instabilities and their potential stabilization by a stellarator field has been investigated with regard to the design of compact hybrid stellarator systems. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1346633
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  • 5
    Electronic Resource
    Electronic Resource
    Ion induced magnetization reorientation in Co/Pt multilayers for patterned media (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5768-5770 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co/Pt multilayer films with perpendicular magnetic anisotropy and large out-of-plane coercivities of 3.9–8.5 kOe have been found to undergo a spin reorientation transition from out-of-plane to in-plane upon irradiation with 700 keV nitrogen ions. X-ray reflectivity experiments show that the multilayer structure gets progressively disrupted with increasing ion dose, providing direct evidence for local atomic displacements at the Co/Pt interfaces. This effectively destroys the magnetic interface anisotropy, which was varied by about a factor of 2, between KS≅0.4 erg/cm2 and KS≅0.85 erg/cm2 for two particular films. The dose required to initiate spin-reorientation, 6×1014 N+/cm2 and 1.5×1015 N+/cm2, respectively, scales with KS. It is roughly equal to the number of Co interface atoms per unit interface area contributing to KS. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372516
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  • 6
    Electronic Resource
    Electronic Resource
    Fast ion losses in the W7-AS stellarator : Papers from the thirteenth topical conference on high temperature plasma diagnostics (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 780-783 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new probe for the detection of fast escaping ions has been installed and operated at the W7-AS stellarator. Fast ions generated from neutral beam injection or ion cyclotron heating were used to study the fast ion confinement properties of the partially drift-optimized magnetic field structure as well as losses induced by magnetohydrodynamic perturbations. The design of the probe is based on the α-particle detectors of the Tokamak Fusion Test Reactor using scintillator plates and allows the detection of co-and countergoing ions simultaneously in a wide range of gyroradii and pitch angles. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1319357
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  • 7
    Electronic Resource
    Electronic Resource
    Micromagnetic study of subnanosecond magnetic switching in perpendicular multilayers (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 2236-2242 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements and micromagnetic modeling results are presented of the subnanosecond magnetization reversal process of perpendicularly magnetized (CoCr/Pt) multilayers. The switching time of the magnetization is primarily dependent on the field strength and field bias angle to the perpendicular direction. The intergranular exchange coupling results in a domino-type magnetization reversal, significant delay in the media response far from the gap edge, and an asymmetry between the maximum upper and lower magnetization levels attained in response to a periodically varying head field. The thermal excitations of the magnetization assist the switching of the magnetization, however, their effect is small and can be neglected, to first order, in studies of high-speed switching of the magnetization in response to a change in the head field polarity. The gyromagnetic switching in the multilayered film appears to be heavily damped. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1432481
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  • 8
    Electronic Resource
    Electronic Resource
    Co1−xCrx/Pt multilayers as perpendicular recording media (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6364-6366 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated Co1−xCrx/Pt multilayers as potential perpendicular media capable of high-density magnetic recording. The films exhibited strong perpendicular anisotropy, coercivity values ranging from 0.3 to 6.9 kOe, and a range of coercive squareness (S*) from 0.21 to 0.96. Magnetic and atomic force microscopy were used to correlate the grain and magnetic domain structures. The degree of intergranular exchange is clearly dependent on the deposition temperature and, to a lesser extent, Cr content. Co1−xCrx/Pt multilayers are ferromagnetic at room temperature for x〉30%, which is not observed in thick Co1−xCrx films. Initial recording results determined a SONR ratio of 23 dB for a [Co(4 Å)/Pt(5 Å)]10 multilayer recorded at 10 kiloflux changes per millimeter using a standard longitudinal ring head. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372707
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  • 9
    Electronic Resource
    Electronic Resource
    Temperature dependent chemical ordering in FePt(001) and FePt(110) films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6956-6958 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The growth temperature is one of the critical parameters in the formation of the chemically ordered L10 phase in FePt. To uniquely determine the influence of growth temperature, while other growth parameters remain fixed, we present the "temperature wedge method" where a calibrated temperature gradient of several hundred Kelvin is established across the substrate during co-deposition of Fe and Pt. Samples were deposited in a temperature range of 250 °C–600 °C simultaneously on MgO(001) and MgO(110) substrates. The Fe(approximate)50Pt(approximate)50 composition was verified by Rutherford backscattering. The chemical order parameter, S, at different positions along the samples, i.e., at different growth temperatures, was determined by x-ray diffraction measurements, and it was found that at all temperatures S(001)〉S(110). Perpendicular and in-plane magneto-optic Kerr hysteresis loop measurements indicate large magnetic anisotropy at the "hot ends" of the samples, corresponding to large values of S. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372898
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  • 10
    Electronic Resource
    Electronic Resource
    Patterning magnetic films by ion beam irradiation (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7004-7006 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have used ion beam irradiation through a silicon stencil mask to alter the magnetic properties of Co/Pt multilayer and FePt chemically-ordered superlattice films. In both systems, ion irradiation disorders the as-grown films which results in a reduction of the magnetic anisotropy. Regularly spaced micrometer-sized regions of magnetically altered material have been produced over areas of a square millimeter. These magnetic structures have been observed by magnetic force microscopy. By stepping the mask during irradiation, features at twice the spatial frequency of the mask holes have been produced. Such patterned magnetic films are of interest for application in high-density magnetic recording. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372912
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