Current-induced modulation of backward spin-waves in metallic microstructures
- Authors
- Sato, Nana; Lee, Seo-Won; Lee, Kyung-Jin; Sekiguchi, Koji
- Issue Date
- 8-3월-2017
- Publisher
- IOP PUBLISHING LTD
- Keywords
- magnonics; spin waves; magnon
- Citation
- JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.50, no.9
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHYSICS D-APPLIED PHYSICS
- Volume
- 50
- Number
- 9
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/84165
- DOI
- 10.1088/1361-6463/aa59d2
- ISSN
- 0022-3727
- Abstract
- We performed a propagating spin-wave spectroscopy for backward spin-waves in ferromagnetic metallic microstructures in the presence of electric-current. Even with the smaller current injection of 5x10(10) A m(-2) into ferromagnetic microwires, the backward spinwaves exhibit a gigantic 200 MHz frequency shift and a 15% amplitude change, showing 60 times larger modulation compared to previous reports. Systematic experiments by measuring dependences on a film thickness of mirowire, on the wave-vector of spin-wave, and on the magnitude of bias field, we revealed that for the backward spin-waves a distribution of internal magnetic field generated by electric-current efficiently modulates the frequency and amplitude of spin-waves. The gigantic frequency and amplitude changes were reproduced by a micromagnetics simulation, predicting that the current-injection of 5x10(11) A m(-2) allows 3 GHz frequency shift. The effective coupling between electric-current and backward spinwaves has a potential to build up a logic control method which encodes signals into the phase and amplitude of spin-waves. The metallic magnonics cooperating with electronics could suggest highly integrated magnonic circuits both in Boolean and non-Boolean principles.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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