Journal
NATURE PHOTONICS
Volume 6, Issue 10, Pages 662-666Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2012.218
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Funding
- KAKENHI [23104706]
- Japan Science and Technology Agency (JST)-Precursory Research for Embryonic Science and Technology (PRESTO)
- National Academy of Sciences of Ukraine (NASU) [220-10]
- Scientific and Technological Center of Ukraine (STCU) [5210]
- Japan Society for the Promotion of Science (JSPS), Invitation Fellowship Programs for Research in Japan
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In future spintronics it is anticipated that spin waves will function as unique information carriers that are free from Joule heating(1-7). Directional control of spin-wave emission has been desired for the realization of switching devices. Here, we propose a promising technique that makes use of a spatially shaped light pulse with circular polarization. Focusing this light pulse on a magnet generates spin waves via the inverse Faraday effect. Moreover, the wavenumber distribution of the spin waves is determined by the spatial intensity distribution of the light spot. We demonstrate the principle of this technique both theoretically and experimentally. We successfully control the direction of the energy flow by shaping the light spot into an ellipse, with its major axis parallel or perpendicular to the magnetic field. Our findings will open up the possibility of fast and arbitrary synthesis of spin-wave patterns by using a more sophisticated light-shaping technique, for example using a computer-generated hologram(8).
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