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Title:
Generation of spin currents by surface plasmon resonance
Authors:
Uchida, K.; Adachi, H.; Kikuchi, D.; Ito, S.; Qiu, Z.; Maekawa, S.; Saitoh, E.
Affiliation:
AA(Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan; PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan), AB(Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan; CREST, Japan Science and Technology Agency, Tokyo 102-0075, Japan), AC(Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan; WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan), AD(Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan), AE(WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan), AF(Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan; CREST, Japan Science and Technology Agency, Tokyo 102-0075, Japan), AG(Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan; Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan)
Publication:
Nature Communications, Volume 6, id. 5910 (2015).
Publication Date:
01/2015
Origin:
NATURE
Abstract Copyright:
(c) 2015: Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
DOI:
10.1038/ncomms6910
Bibliographic Code:
2015NatCo...6E5910U

Abstract

Surface plasmons, free-electron collective oscillations in metallic nanostructures, provide abundant routes to manipulate light-electron interactions that can localize light energy and alter electromagnetic field distributions at subwavelength scales. The research field of plasmonics thus integrates nano-photonics with electronics. In contrast, electronics is also entering a new era of spintronics, where spin currents play a central role in driving devices. However, plasmonics and spin-current physics have so far been developed independently. Here we report the generation of spin currents by surface plasmon resonance. Using Au nanoparticles embedded in Pt/BiY2Fe5O12 bilayer films, we show that, when the Au nanoparticles fulfill the surface-plasmon-resonance conditions, spin currents are generated across the Pt/BiY2Fe5O12 interface. This spin-current generation cannot be explained by conventional heating effects, requiring us to introduce nonequilibrium magnons excited by surface-plasmon-induced evanescent electromagnetic fields in BiY2Fe5O12. This plasmonic spin pumping integrates surface plasmons with spin-current physics, opening the door to plasmonic spintronics.
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