Emergent Magnetic Phenomena at Perovskite/Spinel Oxide Interfaces

非技术描述：自旋电子学基于对电子自旋的操纵，而不是对其电荷的操纵，为更节能、更快的电子结构提供了一条有前途的途径。为了实现这种新结构，需要具有自旋极化的低维材料。在本研究项目中，基于生长在低维金属附近的磁绝缘体，开发了低维自旋极化金属。该研究的成功不仅对复杂氧化物材料，而且对更广泛的材料科学和器件物理具有重要影响。这些研究活动为研究生和本科生提供了教育机会。此外，正在一所新成立的高中进行以迷你课程和课程编制形式进行的高中外联活动。技术描述：本研究项目的重点是在铁磁绝缘体和低维电子气体的界面上形成具有自旋功能的紧急材料的开发。为了使铁磁绝缘体在整个金属层中诱导自旋极化，在钙钛矿钛酸锶表面制备低维电子气体，并与尖晶石结构氧化物材料结合。了解非同构界面上的电子和磁性结构的变化，以及电子和磁性相互作用在多大程度上可以通过该界面进行调整，是本项目的核心。研究活动包括材料合成、结构和磁性表征以及在输运测量中自旋依赖效应的演示。

Non-technical Description: Spintronics, based on the manipulation of the spin of an electron and not its charge, provides a promising avenue for a more energy efficient and faster architecture for electronics. In order to realize such a new architecture, low dimensional materials with spin polarization are required. In this research project, low dimensional spin polarized metals are developed based on a magnetic insulator grown adjacent to a low dimensional metal. Success of the research can have significant impacts on not only complex oxide materials but also more broadly materials science and device physics. These research activities provide educational opportunities for graduate and undergraduate students. In addition, high-school outreach activities at a newly established high school in the form of mini courses and curriculum development are in progress. Technical Description: This research project focuses on the development of emergent materials with spin functionality formed at the interface of a ferromagnetic insulator and a low dimensional electron gas. In order for the ferromagnetic insulator to induce spin polarization in the entire metallic layer, a low dimensional electron gas, made from the surface of perovskite strontium titanate, is combined with a spinel structure oxide material. Understanding the modifications in the electronic and magnetic structure at the non-isostructural interface and the extent to which the electronic and magnetic interactions can be tuned across this interface is the core of this project. The research activities include materials synthesis, structural and magnetic characterization as well as the demonstration of spin dependent effects in transport measurements.