Misfit Dislocation Nucleation Kinetics Studied by Magnetic Properties in Epitaxial Ni/Cu Films

失配位错在外延薄膜中是稳定的 在临界厚度以上，这主要取决于失配 薄膜和衬底之间的距离。 的形成 当临界厚度为100 μ m时， 由于涉及动力学因素， 充分理解。 这项资助研究了不适合的角色 位错和应变影响磁性薄膜的行为。 外延薄膜中位错成核的动力学是 目的是开发一种原位方法， 监测失配位错的形成。 磁光克尔效应 （MOKE）效应被用作探针，该探针对 磁性薄膜中存在小应变。 这用于 表征外延上的失配应变和位错 镍/铜薄膜。 所采用的其他技术是电子 显微镜和二次电子自旋极化分析， 确定位错形成的动力学。 %%% 晶格失配的均匀应变和高度非线性应变， 位错周围的均匀应变对 磁性 这项研究旨在开发 更好地理解错配位错的形成， 它们对磁性薄膜的影响。 现场监测技术 在薄膜生长过程中可能产生的结果。

Misfit dislocations are thermodynamically stable in epitaxial films above a critical thickness, which depends mainly on the misfit magnitude between the film and substrate. The formation of dislocations does not occur immediately when the critical thickness is exceeded since kinetic factors are involved which are not adequately understood. This grant examines the role of misfit dislocations and strain in affecting behavior of magnetic films. The kinetics of dislocation nucleation in epitaxial thin films is pursued with an aim towards developing an in-situ method for monitoring misfit dislocation formation. The Magneto-optic Kerr (MOKE) effect is employed as a probe that is sensitive to the presence of small strains in magnetic films. This is used to characterize misfit strains and dislocations on epitaxial nickel/copper films. Other techniques employed are electron microscopy and secondary electron spin polarization analysis to determine the kinetics of dislocation formation. %%% The homogeneous strain of lattice mismatch and the highly non- uniform strains around dislocations have dramatic effects on magnetic properties. This research is directed towards developing a better understanding of the formation of misfit dislocations and their effects on magnetic films. An in-situ monitoring technique during film growth could result from the research.