Perpendicular magnetic anisotropy properties of CoFeB/Pd multilayers.
Perpendicular magnetic anisotropy properties of CoFeB/Pd multilayers.
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DOI：
10.1166/jnn.2011.4475
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发表时间：
2011-07
影响因子：
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通讯作者：
Jong Ho Jung;S. Lim;S. Lee
中科院分区：
文献类型：
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作者：
Jong Ho Jung;S. Lim;S. Lee
研究了CoFeB/Pd多层膜的垂直磁各向异性（PMA）特性随多层膜组成层厚度和衬底类型的变化。在0.47至1.26 nm的整个Pd厚度范围内，在0.3和0.5 nm的小CoFeB厚度下形成相对强的PMA。在固定的CoFeB厚度下，PMA倾向于随着Pd厚度的增加而增加，并且这种行为可以归因于这样的事实，即在较高的Pd厚度下，界面倾向于变得更平坦和更光滑，从而导致更强的表面各向异性。一个更强的PMA观察到的玻璃基板比MgO基板。由于在CoFeB层处形成的热应力对于玻璃和MgO衬底都是拉伸的，磁弹性相互作用表明在CoFeB/Pd界面处形成具有负饱和磁致伸缩的Co-Pd合金的可能性。
The perpendicular magnetic anisotropy (PMA) properties of CoFeB/Pd multilayers are investigated as functions of the thickness of the constituent layers of the multilayers and of the substrate type. A relatively strong PMA is formed at small CoFeB thicknesses of 0.3 and 0.5 nm over the entire Pd thickness range of 0.47 to 1.26 nm. At a fixed CoFeB thickness, the PMA tends to increase with increasing Pd thickness and this behavior can be attributed to the fact that the interface tends to become flatter and smoother at a higher Pd thicknesss, leading to a stronger surface anisotropy. A stronger PMA is observed for the glass substrate than for the MgO substrate. Since the thermal stress formed at the CoFeB layer is tensile for both the glass and MgO substrates, the magnetoelastic interactions suggest the possibility of forming a Co-Pd alloy with a negative saturation magnetostriction at the CoFeB/Pd interfaces.