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  • American Institute of Physics (AIP)  (2)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5523-5525 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model of thin film permalloy using an efficient finite element variational approach to the magnetostatic field calculation is described. The material is discretized into a nanoelement structure at the micron level which enables us to investigate material properties due to patterning. Predicted domain structures agree well with experimental data. Interactions between elements are significant and it will be shown that the domain structure in the central element differs from that of its neighbors. As expected, the addition of pointed ends stabilizes the single-domain state. Elements with two pointed ends exhibit pseudo-single-domain behavior. We have studied the single-domain/pseudo-single-domain transition for permalloy platelets, results for noninteracting platelets are given as a function of the elongation. Interactions are shown to increase or decrease the critical size depending on the geometry. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1069-1077 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this work we investigate the behavior of small arrays of interacting permalloy particles at the submicron level. Each individual particle is termed a nanoelement and is rectangular in form with varying elongation. The interest in such structures of magnetic material is increasing, due mainly to the possible potential use in future high-density magnetic storage media applications. To carry out our investigations we have developed a dynamical micromagnetic model based on the use of the finite element method. For our results we investigate the effects of misaligned and aligned anisotropy distributions on arrays with varying size and space of nanoelement. We observe that the reversal mechanism of the arrays is very sensitive to the disorder of the intrinsic material properties. In the case of aligned uniaxial anisotropy a highly symmetric cooperative switching mechanism is observed. The larger anisotropy has the effect of stabilizing states during the reversal process, leading to distinctive switching along the hysteresis curve. A random anisotropy breaks this high symmetry sufficiently to reduce the cooperative switching, leading to a relatively random reversal of individual nanoelements. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
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