Control of Spin-Wave Refraction Using Arrays of Skyrmions

• DOI: 10.1103/physrevapplied.6.064027
• Publication Date: 2017-01-04T17:21:33Z
• Authors: Kyoung-Woong Moon; Byong Sun Chun; Wondong Kim; Chanyong Hwang
• Keywords: Skyrmion

$M\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}g\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}c$ $c\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}y\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}s$ are metamaterials with engineered magnetic properties that can be used to manipulate spin waves, for next-generation digital logic and storage. Such an artificial crystal could fashioned from arrays of $s\phantom{\rule{0}{0ex}}k\phantom{\rule{0}{0ex}}y\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}m\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}s$ (hedgehog-like topological objects), in principle. The authors show by controlling the disposition two lines skyrmions asymmetric field nearby currents, a wave refracted. This idea avoids usual patterning magnonic crystal, which is most time-consuming aspect manufacturing.