Tailoring Spin-Wave Channels in a Reconfigurable Artificial Spin Ice

Abstract

$M\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}g\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}c$ $c\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}y\phantom{\rule{0}{0ex}}s\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}s$ are periodic structures that could be used in ultralow-power information technology based on spin waves (magnons). Artificial $s\phantom{\rule{0}{0ex}}p\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}n$ $i\phantom{\rule{0}{0ex}}c\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}s$ have been considered for reconfigurable magnonic crystals, but achieving the required combination of magnetic state reconfigurability and magnon dispersions remains challenging. This study proposes a hybrid system using an underlayer of magnetic thin film to couple and strengthen the magnetic interaction via spin waves. Moreover, the ice's magnetic state gives rise to directional spin-wave channels in the underlayer. This hybrid system offers a fresh approach to band-structure engineering for reconfigurable magnonic crystals.