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  • 1
    Electronic Resource
    Electronic Resource
    The effect of physical structure on δI curves of longitudinal thin film (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4915-4915 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Conventionally, the simulation of thin films has been carried out using an HCP structure to represent its physical structure. Such an idealized structure has been shown to overestimate the effect of interparticle coupling by using an homogeneous exchange coupling scheme. A more realistic approach to represent physical structure has been undertaken by generating a system of grains which lie on a radially isotropic structure and have a nonuniform volume distribution. Interaction effects can be shown by computing δI curves formed through the comparison of the remanence curves using the Wohlfarth relation. To generate an isothermal remanence curve (IRM), a realistic ac erased state is necessary which has been carried out by using a simulated annealing technique. A comparison has been made to determine the effect of physical structure on the bulk properties by computing hysteresis loops, remanence curves, and δI curves. To reduce statistical error these have been averaged over four different sets of easy axes. The loops indicate that an irregular physical structure leads to an increase in the coercivity and decrease in the squareness. The dc-demagnetization curves show an increase in remanent coercivity; this can be attributed to the random physical structure decreasing the size of magnetically correlated regions within the microstructure. The effect of the physical microstructure on the δI curves will be discussed in full in the paper. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361585
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  • 2
    Electronic Resource
    Electronic Resource
    Computational studies of the magnetic permeability of composite soft materials (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5541-5543 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic permeability of composite soft materials is investigated using a numerical model. The model has been specifically developed to study the effect of intergranular interactions. The magnetic properties of densely packed nanocomposite granular are significantly affected by interactions between the grains. In particular, we focus on the effect of grain shape and microstructure on the permeability. The influence of packing density on the initial susceptibility is investigated. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373398
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  • 3
    Electronic Resource
    Electronic Resource
    Theoretical studies of the field-cooled and zero-field cooled magnetization of interacting fine particles (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4340-4342 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have applied a Monte–Carlo model of the properties of an interacting fine particle system to calculations of the field-cooled (FC) and zero-field cooled (ZFC) magnetization. The variation of Tg, the temperature peak, in the ZFC is also calculated. For an interacting system the effective energy barrier distribution is dependent on the packing density, and this is reflected in the Tg vs H curve. An important result is the demonstration that magnetostatic interactions between the particles can give rise to a peak in the FC magnetization. This is in agreement with experiments and is a result of the magnetic order introduced by the magnetostatic interactions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370361
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  • 4
    Electronic Resource
    Electronic Resource
    Simulations of the magnetic properties of thin film media with low coercivity grains (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6154-6156 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article presents an extensive investigation of the effect of low coercivity (LC) grains on the remanence process in exchange coupled longitudinal thin film. In particular, it is shown that the inclusion of LC grains causes an increase in the slope of the magnetization curve in small negative fields leading essentially to a decrease in the stability of the written information. Switching field distributions and δI plots are used to illustrate the effect of LC grains on intergranular interactions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370027
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    Paper (German National Licenses)
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