Optimization of Co/Pt multilayers for applications of current-driven domain wall propagation
Optimization of Co/Pt multilayers for applications of current-driven domain wall propagation
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DOI：
10.1063/1.3654045
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发表时间：
2011-10
影响因子：
3.2
通讯作者：
Ke Wang;M. Wu;S. Lepadatu;J. Claydon;C. Marrows;S. Bending
中科院分区：
文献类型：
--
作者：
Ke Wang;M. Wu;S. Lepadatu;J. Claydon;C. Marrows;S. Bending
用磁控溅射法生长了一系列具有垂直磁各向异性的Co/Pt多层膜，并用磁光Kerr效应测量对其进行了表征，以期优化样品以满足电流驱动磁畴运动的应用。系统地研究了Co层和Pt层厚度对薄膜的矫顽力和开关行为的影响。在Co层厚度为3~7A的多层叠层中，发现了明显的垂直磁各向异性。当Co层厚度进一步增加时，磁化强度回复到面内方向，而矫顽力和剩磁都迅速下降，前者由形状各向异性主导。随着铂缓冲层厚度的增加，垂直磁各向异性得到改善，具有较高的矫顽场。相比之下，铂覆盖层的厚度似乎没有任何系统性的影响。
A series of Co/Pt multilayers with perpendicular magnetic anisotropy has been grown by magnetron sputtering and characterized using magneto-optical Kerr effect measurements with a view to optimizing samples for current-driven domain motion applications. The influence of the thickness of both Co and Pt layers on the coercivity and switching behavior has been systematically investigated. The coercivity was found to depend strongly on the thickness of the Co layer and clear perpendicular magnetic anisotropy was observed in multilayer stacks with Co thickness ranging from 3 to 7 A. Upon increasing the Co thickness further the magnetization reverts to the in-plane direction and both the coercivity and the remanence drop rapidly, with the former becoming dominated by shape anisotropy. Increasing the thickness of the Pt buffer layer leads to improved perpendicular magnetic anisotropy with higher coercive fields. In contrast, the thickness of the Pt capping layers does not appear to have any systematic influence ...