Dramatically Enhanced Spin Dynamo with Plasmonic Diabolo Cavity.

Abstract:

:The applications of spin dynamos, which could potentially power complex nanoscopic devices, have so far been limited owing to their extremely low energy conversion efficiencies. Here, we present a unique plasmonic diabolo cavity (PDC) that dramatically improves the spin rectification signal (enhancement of more than three orders of magnitude) under microwave excitation; further, it enables an energy conversion efficiency of up to ~0.69 mV/mW, compared with ~0.27 μV/mW without a PDC. This remarkable improvement arises from the simultaneous enhancement of the microwave electric field (~13-fold) and the magnetic field (~195-fold), which cooperate in the spin precession process generates photovoltage (PV) efficiently under ferromagnetic resonance (FMR) conditions. The interplay of the microwave electromagnetic resonance and the ferromagnetic resonance originates from a hybridized mode based on the plasmonic resonance of the diabolo structure and Fabry-Perot-like modes in the PDC. Our work sheds light on how more efficient spin dynamo devices for practical applications could be realized and paves the way for future studies utilizing both artificial and natural magnetism for applications in many disciplines, such as for the design of future efficient wireless energy conversion devices, high frequent resonant spintronic devices, and magnonic metamaterials.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Gou P,Qian J,Xi F,Zou Y,Cao J,Yu H,Zhao Z,Yang L,Xu J,Wang H,Zhang L,An Z

doi

10.1038/s41598-017-05634-0

subject

Has Abstract

pub_date

2017-07-13 00:00:00

pages

5332

issue

1

issn

2045-2322

pii

10.1038/s41598-017-05634-0

journal_volume

7

pub_type

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