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弛豫速率，铁磁共振频率线展宽100 MHz。 PI将探索“主动”的弛豫抑制使用旋进泵的自旋电流，研究使用一种新的双频铁磁共振技术。智力价值-拟议的研究将发展的理解自旋动量转移（SMT）相关的影响，在磁性异质结构，并有可能展示自旋泵，理论上发展良好，但实验研究不足的堂兄弟现象SMT下的设备应用。 更广泛的影响-拟议的研究有可能作为一个使技术的高Q，集成GHz频域器件使用铁磁薄膜。 改进的性能将直接在GaAs上开发良好的Ghz器件中进行探索。 主题相关的推广到农村，城市和郊区的K-8学生，通过磁信息存储技术的动手示范展览的联合开发，将与特洛伊，纽约的儿童科学技术博物馆合作开发。

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.