EAPSI:Understanding and Controlling the Properties of Magnetic Semiconductor Nanomaterials based on Europium

EAPSI：了解和控制基于铕的磁性半导体纳米材料的特性

• 批准号: 1515396
• 负责人: Nicholas Rosa
• 金额: $ 0.5万
• 依托单位: Rosa Nicholas
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1515396&HistoricalAwards=false
• 关键词: EAPSI; Understanding; Controlling; Properties; Magnetic

The next generation of electronic devices rests upon two advances in the materials used in their construction: new materials with novel properties and shrinking devices to the nanoscale. Magnetic semiconductors are an exciting but poorly-understood class of materials that display a number of interesting effects desirable for modern electronics applications. In these materials, the electronic, optical, and magnetic properties are highly coupled, leading to a strong interdependence among them. This interdependence allows for control of all of these properties based upon changes in only one. For example, when in a magnetized state, these materials exhibit a large change in their electrical resistance or interaction with polarized light. Understanding how to make these materials and how to control the properties on the nanoscale is an important first step in harnessing them for use in devices from displays to hard drives to processors and quantum computers.For understanding the fundamental properties of magnetic semiconductor nanomaterials, an excellent model system is the europium chalcogenides: oxide (EuO), sulfide (EuS), selenide (EuSe), and telluride (EuTe). All of these materials are indirect bandgap semiconductors that display a range of magnetic behavior from ferromagnetic in EuO and EuS to metamagnetic in EuSe to antiferromagnetic in EuTe. Recently, nanostructures of the europum chalcogenides have been synthesized by the PI?s home research group at Georgetown University and the research group of Yasuchika Hasegawa at Hokkaido University, where the PI will work under this award. These nanostructures are an ideal platform to study the fundamental behavior and coupling exhibited on the nanoscale. Toward this understanding, this project will investigate the synthesis and characterization of cation and anion doped EuS and EuSe nanostructures as a means to control electronic, optical, and magnetic properties by controlling composition. This NSF EAPSI award is funded in collaboration with the Japan Society for the Promotion of Science.

下一代电子设备依赖于其结构中所用材料的两个进步：具有新特性的新材料和将设备缩小到纳米级。磁性半导体是一种令人兴奋但理解甚少的材料，它显示出许多现代电子应用所需的有趣效应。在这些材料中，电子，光学和磁性是高度耦合的，导致它们之间的相互依赖性很强。这种相互依赖性允许基于仅一个属性的变化来控制所有这些属性。例如，当处于磁化状态时，这些材料在其电阻或与偏振光的相互作用方面表现出很大的变化。了解如何制造这些材料以及如何在纳米尺度上控制这些材料的特性是将它们用于从显示器到硬盘驱动器到处理器和量子计算机的设备的重要的第一步。为了了解磁性半导体纳米材料的基本特性，一个很好的模型系统是铕硫属化物：氧化物（EuO），硫化物（EuS），硒化物（EuSe）和碲化物（EuTe）。所有这些材料都是间接带隙半导体，显示出从EuO和EuS中的铁磁性到EuSe中的变磁性到EuTe中的反铁磁性的一系列磁性行为。最近，纳米结构的europum硫族化合物已合成的PI？他的家庭研究小组在乔治敦大学和研究小组在北海道大学的长谷川康亲，在那里PI将根据这项奖励工作。这些纳米结构是研究纳米尺度上的基本行为和耦合的理想平台。为了理解这一点，该项目将研究阳离子和阴离子掺杂的EuS和EuSe纳米结构的合成和表征，作为通过控制组成来控制电子、光学和磁性的手段。这个NSF EAPSI奖是与日本科学促进协会合作资助的。