Acquisition of a Custom Molecular Beam Epitaxy System for Metals and Insulators

采购用于金属和绝缘体的定制分子束外延系统

• 批准号: 9625892
• 负责人: David Lederman
• 金额: $ 18.91万
• 依托单位: West Virginia University Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-07-01 至 1999-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9625892&HistoricalAwards=false
• 关键词: Acquisition; Custom; Molecular; Beam; Epitaxy

9625892 Lederman The considerable recent interest in magnetic thin films and superlattices has been fueled in large part by the potential technological applications of giant magnetoresistance (GMR), exchange anisotropy (EA), and perpendicular anisotropies in metallic ferromagnets. However, numerous topics of interest in this field have not been fully explored, including the magnetic interactions in superlattices composed of alternating metallic and insulating layers, and purely insulating magnetic superlattices. These types of superlattices could further our basic understanding of magnetic interactions and lead to unexpected technologies. The molecular beam epitaxy (MBE) system sponsored by this award is designed to grow and characterize a wide variety of magnetic superlattices, including those composed only of insulators, only of metals, or combinations of insulators and metals. %%% Characterizing the structure of these materials is important because the surface and interface structure in magnetic thin films and superlattices can significantly affect their physical properties. In order to understand these properties, it is crucial to study the surface of these materials as a function of growth parameters, such as film thickness, growth temperature, and growth rate. Structural studies can also aid in distinguishing the structural effects from the intrinsic superlattice and interface effects. This can be done in-situ using surface-sensitive techniques such as reflection high energy electron diffraction (RHEED), low energy electron diffraction (LEED), scanning tunneling microscopy (STM), and x-ray photoelectron spectroscopy (XPS) without contamination from the air. This information will be complemented with ex-situ x-ray diffraction measurements. ***

9625892 LEDERMAN在很大程度上，巨型磁阻（GMR），交换各向异性（EA）和垂直的各向异性在金属磁铁中的潜在技术应用中，对磁性薄膜和超晶格的最新兴趣很大。 但是，在该领域的许多感兴趣主题尚未得到充分探索，包括由交替的金属和绝缘层组成的超晶格中的磁相互作用，以及纯粹的绝缘磁性超晶格。 这些类型的超晶格可以进一步进一步了解磁相互作用，并导致意外的技术。 该奖项赞助的分子束外延（MBE）系统旨在生长和表征各种磁性超晶格，包括仅由仅由金属或绝缘子和金属组合组成的磁性超晶格。 表征这些材料结构的%%%很重要，因为磁性薄膜和超晶格中的表面和界面结构可以显着影响其物理特性。 为了了解这些特性，至关重要的是研究这些材料的表面是生长参数的函数，例如膜厚度，生长温度和生长速率。 结构研究还可以有助于区分结构效应与固有的超晶格和界面效应。 这可以使用表面敏感技术（例如反射高能电子衍射（RHEED），低能电子衍射（LEED），扫描隧道显微镜（STM）和X射线光电子光谱（XPS）等表面敏感技术进行原位。 此信息将与Ex-Situ X射线衍射测量值相辅相成。 ***