Surfactant-Assisted Growth of Giant Magnetoresistive Magnetic Multilayers

表面活性剂辅助生长巨磁阻磁性多层膜

• 批准号: 9731733
• 负责人: Harsh Chopra
• 金额: $ 7.3万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9731733&HistoricalAwards=false
• 关键词: Surfactant; Assisted; Growth; Giant; Magnetoresistive

9731733 Chopra This is a study of NiO-Co-Cu-based "giant" magnetoresistive magnetic multilayers in spin valve configuration, deposited by dc-magnetron sputtering. The goal is to employ surfactants to control elementary film deposition steps at the atomic level in order to modify the nature of interfaces and film morphology. This approach should result in basic understanding of the structure sensitivity of the magneto- transport properties in these layered systems. Deposition of a suitable number of layers of a surfactant on a given layer of a multilayer should alter the balance between surface and interface energies. The potential surfactant species (Ag, As, Sn, Sb, and Pb) are soft metals having large atomic volumes, properties that favor their "floating" out to the surface during over-layer growth and leaving behind intact layers with smooth interfaces less prone to intermixing. Surfactant assisted evolution of surface topography with respect to surfactant-free spin valves is studied at different stages of film growth in-situ and ex- situ (using scanning tunneling microscopy and atomic force microscopy). Surface segregation of surfactants is monitored by X-ray photoelectron spectroscopy. Magnetic properties, domain structures and wall transition in applied field are measured. %%% Artificially modulated magnetic multilayers comprised of magnetic and non-magnetic films are the subjects of intense research. These systems have potential device applications as magneto-optical storage materials using multilayers with perpendicular anisotropy and as next-generation read-heads for high-density storage. ***

9731733 Chopra这是一项研究，对基于Nio-Co的“巨型”磁磁性磁性多层型在自旋阀构型中，由DC-Magnetron溅射沉积。 目的是使用表面活性剂来控制原子水平的基本膜沉积步骤，以改变界面和膜形态的性质。 这种方法应该导致对这些分层系统中磁运输特性的结构灵敏度的基本了解。 在给定的多层层上的表面活性剂层的合适层沉积应改变表面和界面能量之间的平衡。 潜在的表面活性剂物种（AS，SN，SB和PB）是具有较大原子体积的软金属，在过度生长期间，它们有利于其“漂浮”到表面的特性，并留下完整的层，并具有较不愿互混浸的光滑界面。 在膜生长的不同阶段和异地（使用扫描隧道显微镜和原子力显微镜）的不同阶段，研究了表面形貌相对于无表面活性剂自旋阀的表面活性剂辅助演变。 表面活性剂的表面分离通过X射线光电子光谱法监测。 测量了磁性性能，域结构和壁透光率。 由磁性和非磁性膜组成的人为调制的磁性多层是激烈研究的主题。 这些系统具有潜在的设备应用，作为磁光存储材料，使用具有垂直方向性的多层材料，并作为用于高密度存储的下一代读取头。 ***