Laboratoire PROMES CNRS UPR8521, Université de Perpignan Via Domitia, Rambla de la Thermodynamique-Tecnosud, Perpignan, France.
J Phys Condens Matter. 2013 Aug 7;25(31):316003. doi: 10.1088/0953-8984/25/31/316003. Epub 2013 Jul 10.
We investigate the effect of coupling (intensity and nature), applied field, and anisotropy on the spin dynamics of a multi-layer system composed of a hard magnetic layer coupled to a soft magnetic layer through a nonmagnetic spacer. The soft layer is modeled as a stack of several atomic planes while the hard layer, of a different material, is either considered as a pinned macroscopic magnetic moment or again as a stack of atomic planes. We compute the magnetization profile and hysteresis loop of the whole multi-layer system by solving the Landau-Lifshitz equations for the net magnetic moment of each (atomic) plane. We study the competition between the intra-layer anisotropy and exchange interaction, applied magnetic field, and the interface exchange, dipolar or Dzyalozhinski-Moriya interaction. Compared with the exchange coupling, the latter two couplings present peculiar features in the magnetization profile and hysteresis loop that may help identify the nature of the interface coupling in multi-layer magnetic systems.
我们研究了耦合（强度和性质）、外场和各向异性对由通过非磁性间隔层耦合的硬磁层和软磁层组成的多层系统的自旋动力学的影响。软层被建模为几个原子层的堆叠，而硬层，由不同的材料组成，要么被视为固定的宏观磁矩，要么再次被建模为原子层的堆叠。我们通过求解每个（原子）层的净磁矩的 Landau-Lifshitz 方程来计算整个多层系统的磁化曲线和磁滞回线。我们研究了层内各向异性与交换相互作用、外加磁场以及界面交换、偶极子或 Dzyalozhinskii-Moriya 相互作用之间的竞争。与交换耦合相比，后两种耦合在磁化曲线和磁滞回线中表现出特殊的特征，这可能有助于识别多层磁系统中界面耦合的性质。
