Ti底层对Pt/Co/Pt磁性超薄膜结构和形貌的影响
Structural and Morphological Effect of Ti underlayer on Pt/Co/Pt Magnetic Ultra-Thin Film
摘要：
在自然氧化的Si（111）衬底上沉积了Pt（xO 2）/Co（5xO 2）/Pt（10 xO 2）三层膜，研究了Ti衬底对PMA的影响。当x= 80 °和10 °时，少量Ti底层的存在使样品的磁各向异性向垂直方向增强。GI XRD和STM结果表明，Ti底层控制了三层膜的生长。Pt颗粒优选在Ti簇的附近生长，产生具有纤维织构fcc（111）结构的相对光滑的层。相比之下，不存在Ti底层导致成簇的、相对粗糙的和随机取向的纳米晶体生长。生长模式的差异，特别是粗糙度，也出现在XPS光谱中的强度损失，由于阴影效应。我们的研究结果表明，一个可追溯的底层量可以改变磁各向异性的薄膜通过操纵薄膜的生长。
英文摘要：
Pt(xÅ)/Co(5Å)/Pt(10Å) trilayer films were deposited on naturally oxidized Si(111) substrate to investigate Ti underlayer effect on PMA. A small amount of Ti underlayer promoted the magnetic anisotropy to a perpendicular direction for x=8Å and 10Å. Both GI XRD and STM results showed that the Ti underlayer manipulated the growth of trilayer film. The Pt particles preferably grow the neighborhood of the Ti cluster, giving rise to a relatively smooth layer with a fiber texture fcc (111) structure. By contrast, the absence of Ti underlayer leads to clustered, relatively rough, and randomly oriented nano-crystalline growth. Differences in the growth mode, especially roughness, also appeared as intensity loss in XPS spectra due to shadowing effects. Our results indicate that a traceable amount of underlayer can change the magnetic anisotropy of the film by manipulating film growth.
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