Development of In-Situ Magnetic Characterization for Magnetic/Semiconductor Heterostructures Research, Student Training and Education

磁性/半导体异质结构研究、学生培训和教育的原位磁性表征开发

• 批准号: 0076493
• 负责人: Christopher Palmstrom
• 金额: $ 14万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2004-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0076493&HistoricalAwards=false
• 关键词: Development; Situ; Magnetic; Characterization; Semiconductor

0076493PalmstromThis is an award for the development of an in-situ magnetic characterization system that will interconnect to an in-situ atomic level growth and characterization facility. The new instrument will allow magnetic and spin polarization measurements to be made at different stages of magnetic/semiconductor heterostructure growth. These magnetic measurements will be correlated with in-situ structural and elemental studies to obtain a fundamental understanding of ferromagnetic/semiconductor heterostructures and interfaces. The instrument will also be used for in-situ magnetotransport and electroluminescence measurements to determine spin transport across ferromagnetic/semiconductor heterojunctions and magnetoresistance of ferromagnetic epitaxial layers. In designing and developing this instrumentation the students and postdoctoral associates will learn to work as a team and be exposed to multiple disciplines ranging from low temperature and semiconductor physics, superconductivity, optics, magnetics, and UHV practices to molecular beam epitaxy, surface and materials science.This is an award for instrument development at the university of Minnesota-Twin Cities. The possibility of manipulating and detecting the spin of an electron in addition to its charge is the key to the development of "Spintronics", which integrates magnetic and semiconductor materials. However, the detailed knowledge of both the magnetic and electronic properties of ferromagnetic/semiconductor interfaces, is needed to understand and control the electron spin as it crosses the interface. The development of a in-situ magnetic characterization will allow magnetic, magneto-optic and magnetotransport properties of magnetic/semiconductor single crystal structures to be studied during their formation from subatomic layer to micrometer thicknesses as they are grown by molecular beam epitaxy without exposing the structures to air. During this project, students and postdoctoral associates will be acquire skills in experimental techniques (ultra-high vacuum technology, magnetics, optics, cryogenics, superconductivity, electronics, mechanical design and materials processing) as well as in understanding the underlying physics (role of atomic structure at surfaces and interfaces and in the bulk of materials on the magnetic properties of thin films and the spin polarized transport across interfaces between magnetic materials and semiconductors).

0076493 Palmstrom这是一个奖项的发展，在原位磁表征系统，将互连到一个在原位原子级生长和表征设施。新仪器将允许在磁性/半导体异质结构生长的不同阶段进行磁性和自旋极化测量。这些磁性测量将与原位结构和元素的研究，以获得铁磁/半导体异质结构和界面的基本了解。该仪器还将用于原位磁输运和电致发光测量，以确定跨铁磁/半导体异质结的自旋输运和铁磁外延层的磁阻。在设计和开发该仪器的过程中，学生和博士后将学习团队合作，并接触到多个学科，从低温和半导体物理，超导，光学，磁学和超高真空实践到分子束外延，表面和材料科学。这是明尼苏达大学双城分校的仪器开发奖。操纵和检测电子自旋以及电子电荷的可能性是“自旋电子学”发展的关键，“自旋电子学”将磁性材料和半导体材料结合在一起。然而，铁磁/半导体界面的磁性和电子性质的详细知识，需要理解和控制电子自旋，因为它穿过界面。原位磁性表征的发展将允许磁性/半导体单晶结构的磁性，磁光和磁输运特性在其形成过程中从亚原子层到微米厚度进行研究，因为它们是通过分子束外延生长的，而不将结构暴露在空气中。在这个项目中，学生和博士后将获得实验技术的技能（超高真空技术，磁性，光学，低温，超导，电子，机械设计和材料加工）以及理解基础物理（表面和界面处以及材料本体中的原子结构对薄膜的磁性和穿过薄膜的自旋极化输运的作用）磁性材料和半导体之间的界面）。