Pumped Spin Currents for High, Tunable Q in in Integrated RF Magnetic Devices

泵浦自旋电流可在集成射频磁性器件中实现高、可调谐 Q 输入

• 批准号: 0622138
• 负责人: William Bailey
• 金额: $ 24万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-15 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0622138&HistoricalAwards=false
• 关键词: Pumped; Spin; Currents; Tunable; Integrated

Objective--Metallic ferromagnets suffer from relatively high Ghz relaxation rates, with ferromagnetic resonance frequency line broadening 100 MHz. The PI will explore "active" suppression of relaxation using precessionally pumped spin currents, studied using a novel dual-frequency ferromagnetic resonance technique. Intellectual merit--The proposed research will develop understanding of spin momentum transfer (SMT)-related effects in magnetic heterostructures, and have the potential of demonstrating a device application for spin pumping, a theoretically well developed but experimentally under-studied cousin phenomenon under SMT. Broader Impact--The proposed research has potential as an enabling technology for high-Q, integrated Ghz frequency-domain devices using ferromagnetic thin films. Improved performance will be explored directly in a well-developed Ghz device on GaAs. Thematically related outreach to rural, urban, and suburban K-8 students, through the joint development of a hands-on demonstration exhibit of magnetic information storage technology, will be developed in partnership with the Children's Museum of Science and Technology in Troy, NY.

目的金属铁磁体具有较高的GHz弛豫率，其铁磁共振频线展宽为100 MHz。PI将探索使用预先泵浦的自旋电流来“主动”抑制弛豫，这是利用一种新的双频铁磁共振技术进行的研究。智力优势--拟议的研究将加深对磁性异质结构中与自旋动量转移(SMT)相关的效应的理解，并有可能展示一种用于自旋泵浦的设备应用，自旋泵浦是一种在SMT下理论上发展得很好但实验研究不足的表亲现象。更广泛的影响--拟议的研究有可能成为使用铁磁薄膜的高Q、集成GHz频域设备的使能技术。性能的改善将直接在发展良好的GHz器件上进行探索。将与纽约州特洛伊的儿童科学和技术博物馆合作，通过共同开发磁信息存储技术动手示范展览，向农村、城市和郊区的K-8学生开展主题相关的外联活动。