论文标题
在交换耦合的铁 - /铁磁双层中磁化反转的微观起源
Microscopic origin of magnetization reversal in exchange-coupled ferro-/ferrimagnetic bilayers
论文作者
论文摘要
在这项研究中，研究了由铁磁性TBFECO合金层和铁磁[CO/NI/PT] N多层组成的交换耦合双层系统的磁反转过程。特别是，较小的循环研究仅探测柔软的铁磁层的逆转特征，揭示了两种不同的逆转机制，这些机制在很大程度上取决于铁磁层的厚度。对于较厚的层，观察到宏观小环的不可逆转切换。通过高分辨率磁力显微镜详细研究了这种逆转过程的基本显微镜起源，表明逆转是由通过铁磁层传播的平面内域壁触发的。相比之下，薄铁磁层显示出无滞后的反转，由于粒度/ni/pt多层的磁各向异性的晶粒对晶粒变化而被核定为主导，并且与磁性硬tbfeco层相连，因此通过微瘤层确认了微观量子。
In this study, the magnetic reversal process of exchange-coupled bilayer systems, consisting of a ferrimagnetic TbFeCo alloy layer and a ferromagnetic [Co/Ni/Pt]N multilayer, was investigated. In particular, minor loop studies, probing solely the reversal characteristics of the softer ferromagnetic layer, reveal two distinct reversal mechanisms, which depend strongly on the thickness of the ferromagnetic layer. For thick layers, irreversible switching of the macroscopic minor loop is observed. The underlying microscopic origin of this reversal process was studied in detail by high-resolution magnetic force microscopy, showing that the reversal is triggered by in-plane domain walls propagating through the ferromagnetic layer. In contrast, thin ferromagnetic layers show a hysteresis-free reversal, which is nucleation-dominated due to grain-to-grain variations in magnetic anisotropy of the Co/Ni/Pt multilayer and an inhomogeneous exchange coupling with the magnetically hard TbFeCo layer, as confirmed by micromagnetic simulations.
