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  • 1
    Electronic Resource
    Electronic Resource
    The role of NiAl underlayers in longitudinal thin-film recording media (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7441-7444 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Longitudinal recording media made with chromium and with nickel-aluminum underlayers are compared. NiAl films have smaller grains and random crystallographic orientation, while Cr films have larger grains and either a {110} or a {200} preferred orientation depending on the deposition conditions. Cobalt alloy films grown on NiAl have nearly random crystallographic orientation and significant c-axis out-of-plane component, and lower hysteresis loop squareness and coercivity than films made on a heated Cr underlayer. NiAl-underlayer media do not exhibit in-plane magnetic anisotropy induced by the substrate texture lines. CoCrTaPt/Cr/NiAl media had higher overwrite than CoCrTaPt/Cr media due to higher coercive squareness and a sharper hysteresis loop closure. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365285
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  • 2
    Electronic Resource
    Electronic Resource
    The role of stress-induced anisotropy in longitudinal thin film magnetic recording media : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5342-5344 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of stress and magnetostriction have been made in longitudinal CoCrTa magnetic recording media. The stress in Cr and CoCrTa/Cr films deposited onto grooved substrates is higher parallel to the grooves compared to perpendicular to the grooves by up to a few hundred MPa. Combined with a magnetostriction coefficient of −3×10−5 in CoCr10Ta6/Cr, magnetostriction makes a contribution to the in-plane anisotropy observed in such media. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361914
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  • 3
    Electronic Resource
    Electronic Resource
    Micromagnetic behavior of conical ferromagnetic particles (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 1310-1319 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Large area arrays of cobalt and nickel particles with truncated conical shapes and diameters of 80–120 nm have been prepared using interference lithography combined with an evaporation and lift-off process. The magnetic hysteresis has been measured and the remanent states of the particles have been compared with a three-dimensional micromagnetic model. The model shows a transition from "flower" to "vortex" magnetization states as the particle size increases. The distribution of switching fields and the magnetostatic interactions between particles have been characterized. Both lead to a slow approach to saturation in the hysteresis loops. The suitability of such arrays for data storage is discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1331656
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  • 4
    Electronic Resource
    Electronic Resource
    Pulsed laser deposition of iron oxide films (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 4453-4456 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Iron oxide films have been grown onto MgO and oxidized silicon substrates using pulsed laser deposition with a KrF laser. Films deposited in vacuum consisted of the stoichiometric ferrimagnetic γ-Fe2O3 phase, with a saturation magnetization of 371±27 kA/m. However, films deposited in an O2 atmosphere were iron deficient and consisted of the antiferromagnetic α-Fe2O3 phase, with a saturation magnetization of 40±10 kA/m. Films predominantly consisting of the metastable γ-Fe2O3 phase at least 680 nm in thickness could be grown on MgO (001) substrates, which is thicker than films reported elsewhere. The effects of stoichiometry, thickness, and annealing on the magnetic properties of the films are discussed. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1456248
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of temperature and cubic anisotropy on the switching field of cylindrical Ni particles (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1018-1023 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The switching fields of nickel cylinders with ∼100 nm dimensions have been compared to the predictions of a numerical micromagnetic model. The switching field decreases with increasing diameter and decreasing aspect ratio, and there is a good agreement between the measured and calculated values. The samples have a strong 〈111〉 preferred crystal orientation, and the large increase in switching field and switching field distribution with decreasing temperature can be explained by the large increase in magnetocrystalline anisotropy at low temperatures. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1484223
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of anodization on the electromigration drift velocity in aluminum films (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 2349-2355 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electromigration drift velocity has been measured, using the Blech–Kinsbron [Thin Solid Films 25, 327 (1975)] edge displacement method, for aluminum thin films under different thicknesses of anodization. The drift velocity is found to decrease with increasing anodization thickness. The results are interpreted in terms of a change in the self-diffusivity of aluminum as a result of the compressive stresses imposed by the anodized layer. The effect of the variation of diffusivity with stress on the stress distribution within a drifting thin-film sample is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344266
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  • 7
    Electronic Resource
    Electronic Resource
    Measurements of interdiffusion in electrodeposited nickel-phosphorus multilayers (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2773-2780 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interdiffusivity within multilayered electrodeposited thin films of NiPx/NiPy has been measured using an x-ray technique. The NiPx, which can be deposited in the range 0≤x≤25 at. %, is crystalline at low phosphorus content but amorphous at high phosphorus content, so that films with a range of crystalline and amorphous structures could be prepared. Measurements on fully amorphous multilayers, where x,y(approximately-greater-than)18 at. %, give an interdiffusivity of order 10−22 m2 s−1 at 120 °C, which decreases with time, probably due to structural relaxation. The diffusivity decreases with decreasing repeat length of the films, with a critical repeat length of 40 A(ring). Crystalline/amorphous films show qualitatively different behavior, with the low-phosphorus layer governing the extent of a more limited diffusion phenomenon. This has been interpreted as the diffusion of phosphorus into a limited number of sites within the grain boundaries of the crystalline layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351528
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  • 8
    Electronic Resource
    Electronic Resource
    The role of NiAl underlayers in longitudinal recording media (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4369-4369 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: NiAl has been proposed as a replacement for the Cr underlayer in longitudinal recording media.1 NiAl has a B2 ordered structure with a lattice parameter close to that of Cr. Hence the same epitaxial relationships that exist in CoCrPt/Cr could also exist in CoCrPt/NiAl. Although high coercivity media have been made using a NiAl underlayer, a detailed microstructural study of the CoCrPt/NiAl is lacking. We have investigated the crystal orientation and epitaxial relationships in CoCrPt/NiAl bilayers deposited by DCM sputtering at a range of deposition temperatures up to 250 °C and sputter rates of 0.5–10 nm/s. Samples were examined by high resolution transmission electron microscopy in cross section and plan view. None of the samples showed the (002) NiAl/(11¨20)Co orientation that would be expected by analogy to CoCrPt/Cr films deposited at high temperatures. The CoCrPt crystals in the CoCrPt/NiAl are oriented with their c axes at a range of angles to the film plane, accounting for the lower squareness (Sq) of the magnetic hysteresis loop compared to samples on Cr underlayers. There is no evidence of the "bicrystal" structure in CoCrPt/NiAl as is seen on films grown on Cr.2 Grain size in NiAl is smaller than in Cr giving a smaller grain size in the CoCrPt overlayer and potentially lower medium noise. However, coercivity of CoCrPt/NiAl is lower than CoCrPt/Cr. The coercivity increases as the NiAl film thickness increases, and this is believed to be caused by topographic isolation of the magnetic grains.3 Recording measurements on CoCrPt/NiAl and CoCrPt/Cr media show that noise is lower in isotropic media made on the NiAl underlayer compared to oriented media made on the Cr underlayer. The microstructural results will be compared with previously published results on NiAl underlayers and the utility of NiAl as an underlayer in high density media will be assessed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364825
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  • 9
    Electronic Resource
    Electronic Resource
    New dual-bath technique for electrodeposition of short repeat length multilayers (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2182-2184 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An electrodeposition technique for making multilayered thin films, based on controlled deposition from two different solutions, is described. Ni/NiPx and NiPx/NiPy multilayered thin films with repeat lengths as low as 20 A(ring) have been prepared. They show up to three low-angle x-ray peaks corresponding to the electron density modulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102351
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  • 10
    Electronic Resource
    Electronic Resource
    Double textured cylindrical block copolymer domains via directional solidification on a topographically patterned substrate (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 848-850 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Directional solidification of cylinder forming block copolymer films confined between a directionally crystallizing solvent (benzoic acid) and a topographically patterned silicon substrate imparts a particular orientation to the block copolymer microdomains that is dependent of the solidification direction and the local film thickness. The substrate features (30 nm high, 2μm wide square mesas on a 4μm sq lattice) shape the film morphology by periodically modulating the local film thickness. Thicker regions between substrate features (plateaus) exhibit in-plane cylinders aligned in the crystallization direction and thinner regions over the substrate features (mesas) display vertically aligned cylindrical domains. This approach is a simple and general technique for engineering an intended domain orientation in specific areas of a block copolymer film. Development of this method for nanolithographic applications is demonstrated through oxygen plasma reactive ion etching of the patterned cylindrical domains. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1389766
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