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  • 1995-1999  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Sensitivity enhancement of Co/Pt superlattices through underlayer composition modification : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5704-5706 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co/Pt superlattice films for magneto-optical recording have a relatively high Curie temperature compared to rare earth-transition metal films, which has led to criticism of their recording sensitivity at higher disk velocities. We have prepared high-performance Co/Pt disk recording media using (In2O3)100–x(SnO2)x (ITO) as the underlayer. We have observed a two-fold increase in recording sensitivity as x is increased from 0 to 75 mol % SnO2. We have correlated measured sensitivity behavior with composition-induced changes in the microstructure and electrical resistivity in the ITO underlayer. ITO deposited with low SnO2 content exhibits crystalline microstructure and low electrical resistivity, whereas ITO deposited with high SnO2 content exhibits amorphous microstructure and high electrical resistivity. The reduction in crystallinity with increasing SnO2 content is expected to decrease the ITO thermal conductivity, which can explain the increase in recording sensitivity. Small changes in Co/Pt coercivity as a function of x can easily be compensated by adjusting the ITO sputtering pressure. The optimum combination of Co/Pt sensitivity and coercivity can be readily achieved by controlling the ITO underlayer composition and sputtering pressure. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362224
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High-performance Co/Pt multilayer magneto-optical disk using ultrathin seed layers : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3839-3841 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have prepared high-performance disks based on Co/Pt multilayers using ultrathin seed layers. Both crystalline (such as ZnO) and amorphous [such as indium-tin-oxide (ITO) and Si] materials were used as seed layers. We found that very thin layers of these materials enhance coercivity, squareness of the Kerr loop, and perpendicular anisotropy of the Co/Pt superlattices. These beneficial effects are obtained with a seed layer as thin as 0.2 nm. This is incontrast with the earlier presumptions that indicated much thicker layers, about 80 nm of crystalline material, were required to improve the texture of the Co/Pt multilayer for sufficient enhancement in the coercivity. Further, the data indicated that disks with amorphous seed layers generally have higher perpendicular anisotropy and lower recording noise as compared to those with crystalline ZnO. We have prepared disks using a thin amorphous ITO seed layer and a simple disk structure: grooved PC/ITO/12[Co/Pt]/lacquer overcoat. The performance of these disks is similar to that a commercial TbFeCo media. This media has potential for low cost manufacturing. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364725
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    New high performance magneto-optic media: Tb/Bi/FeCo and Tb/Pb/FeCo superlattices (invited) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3833-3837 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tb/Bi/FeCo and Tb/Pb/FeCo superlattices are demonstrated to offer Kerr rotation and figure of merit (reflectivity times Kerr rotation) substantially exceeding that offered by conventional TbFeCo recording materials, particularly at blue wavelengths. Superlattices such as 4.4 Å Tb/2.0 Å Bi/5.0 Å Fe0.6Co0.4 exhibit squarenesses suitable for magneto-optical recording and figure of merits of 0.20, 0.18, and 0.14 at wavelengths of 780, 650, and 430 nm, respectively. Dynamic testing with 780 and 490 nm light demonstrates that the high figures of merit translate to carriers several dB above those produced by TbFeCo alloys. Furthermore, very high carrier-to-noise ratios such as 54 dB at a mark length of 0.75 μm (4 MHz) and 60 dB at long mark lengths (1 MHz) are obtained using 490 nm light and a bandwidth of 30 kHz. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364898
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    Paper (German National Licenses)
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