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  • 1
    Electronic Resource
    Electronic Resource
    Preisach modeling of a magneto-optical medium with perpendicular magnetization (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4382-4384 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magneto-optical Kerr effect measurements on a (0.3 nm Co/0.6 nm Pt)15 multilayer film with perpendicular magnetization showed Kerr rotation hysteresis loops that are very square, but asymmetric: on the descending major loop, while the magnetization decreases rapidly once the applied field approaches the coercive field, there is a long tail as saturation is approached. Modeling of this behavior was performed using a Preisach-based approach. To account for the known changes in magnetization behavior as a function of the number of bilayers, the Preisach density function was replaced by the sum of as many Gaussian distributions as there were bilayers in the material. The parameters of these Gaussian functions were systematically varied. The resulting model shows a good fit to both the experimental major loop and a first-order reversal curve. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369791
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  • 2
    Electronic Resource
    Electronic Resource
    Kerr imaging of a Co/Pt bimodal magneto-optical medium (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5169-5171 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spatially resolved magneto-optical (MO) images of a (0.3 nm Co/1.2 nm Pt)15 multilayer film with perpendicular magnetic anisotropy have been obtained by Kerr microscopy. This material exhibits a major hysteresis loop with two-step magnetization reversal. The MO images display four possible "stable" magnetic states distinguished by four different intensities. This behavior is explained by the presence of two different magnetic phases each which has a stable magnetization state either parallel or antiparallel to the applied field, and which may reverse quasi-independently from one another. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369113
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  • 3
    Electronic Resource
    Electronic Resource
    Magneto-optical behavior in Co/Pt ultrathin film multilayers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5765-5767 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magneto-optical Kerr effect measurements performed on (0.3 nm Co/x Pt)15 multilayers with x=0.3–2.0 nm showed all samples to exhibit strong perpendicular magnetic anisotropy. Recent work has shown that for compositions near (0.3 nm Co/1.2 nm Pt)15, both polar Kerr rotation and ellipticity exhibit bimodal reversals in which the major hysteresis loops have two distinct field-dependent steps due to the contributions of two magnetic phases. To better understand this bimodal magnetization phenomenon, Kerr rotation and ellipticity were determined as a function of radial position from the center to the edge of this disk sample. These measurements exhibit a continuous variation from two-step (bimodal) behavior in the center to single-step (unimodal) behavior at the edge. Since these films were deposited via MBE with a heated substrate, it is believed that this phenomenon is related to thermally induced variations in interface effects such as alloying, abruptness, and morphology. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372515
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic aftereffect in a bimodal Co/Pt magneto-optical medium (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5983-5985 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magneto-optical Kerr effect measurements were used to perform magnetic aftereffect studies of the reversal behavior in a bimodal magneto-optical medium with perpendicular magnetic anisotropy. This (0.3 nm Co/1.2 nm Pt)15 multilayer film has shown both the Kerr rotation (θK) and ellipticity (εK) to exhibit major hysteresis loops with two distinct field-dependent steps. However, whereas both steps in the θK loop occur in the same direction, in the εK loop they occur in opposite directions. Thus, upon traversing the descending major loop, at the first magnetic reversal, εK increases even though the magnetization decreases. Magnetic aftereffect in this material was investigated in the vicinity of each magnetization step by measuring both θK and εK over time. The data clearly show the time dependence of each of the two separate reversals, including the changes in εK which occur in opposite directions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370011
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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