Spin-current nano-oscillator based on nonlocal spin injection

• Type of Material: Article
• Authors: V.E. Demidov, University of Muenster; Sergei Urazhdin, Emory University; A. Zholud, Emory University; A. V. Sadovnikov, University of Muenster; A. N. Slavin, Oakland University; S. O. Demokritov, University of Muenster
• Language: English
• Date: 2015-02-26
• Publisher: Nature Publishing Group: Open Access Journals - Option C
• Publication Version: Final Published Version
• Copyright Statement: © 2015, Macmillan Publishers Limited. All rights reserved
• License: Creative Commons Attribution 4.0 International
• Final Published Version (URL): http://dx.doi.org/10.1038/srep08578
• Title of Journal or Parent Work: Scientific Reports
• ISSN: 2045-2322
• Volume: 5
• Start Page: 8578
• End Page: 8578
• Grant/Funding Information: This work was supported in part by the Deutsche Forschungsgemeinschaft (DFG), the US National Science Foundation, and the program Megagrant An external file that holds a picture, illustration, etc. Object name is srep08578-m2.jpg 2013-220-04-329 of the Russian Ministry of Education and Science.; This work was partially supported by the Grants Nos. ECCS-1305586 and DMR-1015175 from the National Science Foundation of the USA.
• Keywords: oscillation characteristics; nonlocal spin injection; static magnetic field; quasilinear dynamical model
• Research Categories: Physics, General

Abstract

Nonlocal spin injection has been recognized as an efficient mechanism for creation of pure spin currents not tied to the electrical charge transfer. Here we demonstrate experimentally that it can induce coherent magnetization dynamics, which can be utilized for the implementation of novel microwave nano-sources for spintronic and magnonic applications. We show that such sources exhibit a small oscillation linewidth and are tunable over a wide frequency range by the static magnetic field. Spatially resolved measurements of the dynamical magnetization indicate a relatively large oscillation area, resulting in a high stability of the oscillation with respect to thermal fluctuations. We propose a simple quasilinear dynamical model that reproduces well the oscillation characteristics.