反铁磁耦合多层膜中的磁阻态
Magnetic remanent states in antiferromagnetically coupled multilayers
摘要：
在垂直各向异性的反铁磁耦合多层膜中，由于长程退磁场和短程层间交换耦合之间的密切竞争，可以稳定不寻常的多畴织构。特别是，反铁磁基态内特定拓扑稳定的平面缺陷的形成和演化，即具有在有限宽度上延伸的铁磁配置的壁状结构，解释了最近在[Co/Pt（Pd）]/Ru和[Co/Pt]/NiO多层膜中观察到的配置滞后现象。在一个唯象理论，我们分析得出的反铁磁交换，偏置磁场，和多层膜的几何参数的函数的这些“铁能带”缺陷的平衡尺寸。在磁相图中，铁磁带的存在区域介于具有尖锐的反铁磁畴壁和规则排列的铁磁条的图案区域之间。理论结果得到了[Co/Pt]/Ru中所观察到的Reynolds态的磁力显微图像的支持。
英文摘要：
In antiferromagnetically coupled multilayers with perpendicular anisotropy unusual multidomain textures can be stabilized due to a close competition between long-range demagnetization fields and short-range interlayer exchange coupling. In particular, the formation and evolution of specific topologically stable planar defects within the antiferromagnetic ground state, i.e. wall-like structures with a ferromagnetic configuration extended over a finite width, explain configurational hysteresis phenomena recently observed in [Co/Pt(Pd)]/Ru and [Co/Pt]/NiO multilayers. Within a phenomenological theory, we have analytically derived the equilibrium sizes of these "ferroband" defects as functions of the antiferromagnetic exchange, a bias magnetic field, and geometrical parameters of the multilayers. In the magnetic phase diagram, the existence region of the ferrobands mediates between the regions of patterns with sharp antiferromagnetic domain walls and regular arrays of ferromagnetic stripes. The theoretical results are supported by magnetic force microscopy images of the remanent states observed in [Co/Pt]/Ru.
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