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

这是一项原位磁性表征系统的开发，该系统将与原位原子级生长和表征设施互连。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。这些磁测量将与原位结构和元素研究相关联，以获得对铁磁/半导体异质结构和界面的基本理解。该仪器还将用于原位磁输运和电致发光测量，以确定铁磁/半导体异质结的自旋输运和铁磁外延层的磁电阻。在设计和开发该仪器的过程中，学生和博士后同事将学习作为一个团队工作，并接触多个学科，从低温和半导体物理、超导、光学、磁学、特高压实践到分子束外延、表面和材料科学。这是明尼苏达大学双城分校的仪器研发奖。除了电荷之外，操纵和探测电子自旋的可能性是“自旋电子学”发展的关键，它集成了磁性和半导体材料。然而，需要对铁磁/半导体界面的磁性和电子特性的详细了解，才能理解和控制电子穿过界面时的自旋。原位磁性表征的发展将允许研究磁性/半导体单晶结构的磁性、磁光和磁输运性质，因为它们是通过分子束外延在不暴露于空气中的情况下从亚原子层到微米厚度的形成过程。在此项目中，学生和博士后将掌握实验技术(超高真空技术、磁学、光学、低温、超导、电子、机械设计和材料加工)以及理解潜在的物理（原子结构在表面和界面上的作用，以及在薄膜的磁性和磁性材料和半导体之间的界面的自旋极化输运的大部分材料）。

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).