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  • 1
    Electronic Resource
    Electronic Resource
    On the relaxation of simple magnetic systems : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6479-6481 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The relaxation at constant applied field and temperature of a simple magnetic system is evaluated in the framework of the micromagnetic approximation and using a Monte Carlo algorithm. Our results, and particularly, those corresponding to the time evolution of the probability of magnetic moment reversal, evidence remarkable differences with the classical Arrehnius–Néel predictions. These differences are linked to the fact that relaxation proceeds through the formation of structures involving a large number of degrees of freedom. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361977
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  • 2
    Electronic Resource
    Electronic Resource
    Real time quantification of Monte Carlo steps for different time scales (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4798-4800 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time quantification of Monte Carlo steps is studied by the implementation of a new technique which takes into account the realistic size of thermal fluctuations of magnetization along with Landau–Lifshitz–Gilbert dynamic correlations. The computational model has been specifically developed for an ensemble of isolated single-domain particles. The numerical results have been compared with Langevin dynamics calculations and theoretically predicted Brown's asymptotes for relaxation time of single spin system. In addition we demonstrated that real time quantification of Monte Carlo steps is also possible for different time scales. Implementation of real time scales into Monte Carlo calculations for different sizes of time steps is shown to be convergent to the expected value if the Monte Carlo acceptance rate is taken into account. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373163
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of the system parameters on the non-Arrhenius magnetic relaxation of systems having distributed properties : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6509-6511 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated, in the framework of the micromagnetic approximation, the relaxation behavior of both simple systems and systems having distributed properties. In the case of single-particle-type systems, our study focused on the exchange constant dependence of the so-called "waiting time" for the onset of the relaxation to conclude that this parameter linearly increased with the increase of the exchange constant. Our results for the relaxation of polycrystalline-type systems having distributed anisotropy easy axes showed the occurrence in limited time ranges of a magnetization decrease which was adequately fitted by the M(t)−M(0)∝ ln(t+t0) law. The exchange constant dependence of the additive fitting parameter in the logarithmic law qualitatively reproduced that of the waiting time indicating that both parameters were linked to the same underlying characteristic of the demagnetization process: the coupling of the magnetic moments forming the domain-wall-like structures through which the system reversed its magnetization. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367691
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  • 4
    Electronic Resource
    Electronic Resource
    Micromagnetic simulation of the relaxation processes taking place in systems with distributed properties : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5573-5575 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have examined, in terms of the micromagnetic approach, the thermally activated demagnetization behavior of a 1D model polycrystalline material having distributed local easy axes directions. Our analysis was based on the evaluation of the time dependence of the magnetization under different constant demagnetizing fields. From our results, we conclude that (i) thermally activated demagnetization proceeds through a nucleation-propagation mechanism, (ii) the time evolution of the magnetization can be well described in terms of ln(t+T0) laws, and (iii) the activation length (the 1D equivalent of the activation volume) gives a measure of the thickness of the walls limiting the regions reversed during the relaxation process. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364604
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    Paper (German National Licenses)
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