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

目的：金属铁磁体具有相对较高的Ghz弛豫率，其铁磁共振频率线拓宽100 MHz。PI将利用一种新的双频铁磁共振技术，探索利用进动泵浦自旋电流对弛豫的“主动”抑制。智力优势——提出的研究将加深对磁异质结构中自旋动量转移（SMT）相关效应的理解，并具有展示自旋泵浦器件应用的潜力，自旋泵浦是一种理论上发展良好但实验研究不足的SMT表表现象。更广泛的影响——提议的研究有潜力成为使用铁磁薄膜的高q、集成Ghz频域器件的使能技术。改进的性能将直接在GaAs上开发良好的Ghz器件中进行探索。通过与纽约特洛伊的儿童科学技术博物馆合作，共同开发磁性信息存储技术的实际演示展览，向农村、城市和郊区的K-8学生提供主题相关的推广服务。

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.