Linear and Nonlinear Magneto-Optical Kerr Effect Studies of Nanostructures

9970058好处这项建议的目标是开展研究，旨在进一步了解先进的纳米结构材料的磁结构，包括磁性薄膜和多层膜，主要利用线性和非线性磁光克尔效应(MOKE和NLMOKE)检查。这项工作预计对磁光数据记录和高密度垂直磁记录介质都具有相关性。磁光数字信息存储利用介质的克尔旋转来读出数据。介质还必须具有适合于稳定信息存储的某些磁特性，包括垂直易轴磁各向异性、正方形环路和高矫直力。非线性磁光克尔效应的出现给磁光材料带来了一系列新的研究挑战。特别是，非线性克尔角在线性角度上得到了极大的增强，大大扩展了材料的选择范围。由于克尔角较大，确定优值系数的其他因素可以在确定技术前景的材料时得到强调。MOKE测量将在一系列不同铂厚度的钴/铂和类似的多层膜样品上进行，以系统地探索磁结构和磁后效的细节，并对结果进行模拟。这项研究将基于Preisach方法，开发和应用新的和先进的纵向和垂直记录介质的宏观滞后模型。MOKE测量也将在磁性薄膜和多层膜的原位生长过程中进行，我们将在我们的MOKE设备中设计和安装一个特殊的电化学池。将使用线性MOKE来探索层的磁性随其厚度的变化，并使用NLMOKE来监测磁性薄膜和衬底之间的界面处的磁性。

9970058BennettThe goal of this proposal is to undertake research aimed at furthering the understanding of the magnetic structure of advanced nanostructural materials, including magnetic thin films and multilayers, utilizing primarily linear and non-linear magneto-optical Kerr effect (MOKE and NLMOKE) examinations. This work is expected to have relevance both to magneto-optical data recording and to high-density perpendicular magnetic recording media. Magneto-optical digital information storage uses the Kerr rotation of the medium for data readout. The medium must also have certain magnetic characteristics suitable for stable information storage including perpendicular easy axis magnetic anisotropy, a square loop, and high coercivity. The advent of the nonlinear magneto-optical Kerr effect introduces a new set of research challenges to materials suitable for magneto-optical applications. In particular, the fact that the nonlinear Kerr angle is greatly enhanced over the linear angle expands the choice of materials greatly. With a large Kerr angle, other factors in determining the figure of merit can be emphasized in identifying technologically prospective materials.MOKE measurements will be carried out on a series of Co/Pt and similar multilayer samples with different Pt thicknesses to probe the details of the magnetic structure and magnetic aftereffect in a systematic way and to model these results. The research will entail the development and application of new and advanced macroscopic hysteresis models for both longitudinal and perpendicular recording media, based on the Preisach approach.MOKE measurements will also be performed during the in situ growth of magnetic films and multilayers, in a special electrochemical cell we will design and install in our MOKE apparatus. The changes in the magnetic properties of a layer as a function of its thickness will be explored using linear MOKE, and the magnetism at the interface between the magnetic film and the substrate will be monitored with NLMOKE.***