磁三层点中的涡旋稳定
Vortex stabilization in magnetic trilayer dots
摘要：
对Co/绝缘体/Ni_（80）Fe_（20）三层圆形量子点的磁化反转和自旋结构进行了数值研究。本文研究了一层软磁坡莫合金（Py= Ni_（80）Fe_（20））层和一层硬铁磁钴层之间的偶极耦合效应。我们发现，由于Co层的磁杂散场，Py层中的涡旋态的稳定甚至触发，而Co磁化保持在单畴状态。此外，对于薄Py层，观察到360度畴壁。我们构建了一个相图，其中标记了涡旋稳定、触发和360度畴壁发生的区域。
英文摘要：
The magnetization reversal and spin structure in circular Co/insulator/Ni80Fe20 trilayer dots has been investigated numerically. The effect of dipolar coupling between a soft ferromagnetic Permalloy (Py=Ni80Fe20) layer and a hard ferromagnetic Cobalt layer inside one stack is studied. We find either a stabilization or even a triggering of the vortex state in the Py layer due to the magnetic stray field of the Co layer, while the Co magnetization remains in a single-domain state. Furthermore, for thin Py layers a 360 deg-domain wall is observed. We construct a phase diagram, where regions of vortex stabilization, triggering, and occurrence of a 360 deg domain wall are marked.
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