Tailoring Spin-Wave Channels in a Reconfigurable Artificial Spin Ice
Tailoring Spin-Wave Channels in a Reconfigurable Artificial Spin Ice
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DOI：
10.1103/physrevapplied.13.044047
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发表时间：
2020-04-17
影响因子：
4.6
通讯作者：
Heinonen, Olle G.
中科院分区：
文献类型：
--
作者：
Iacocca, Ezio;Gliga, Sebastian;Heinonen, Olle G.
人造自旋冰是几何排列的相互作用纳米磁体的集合，它们在实现可重构磁子晶体方面表现出了巨大的潜力。这种系统允许在纳米尺度上操纵自旋波及其作为信息载体的潜在用途。然而，目前实现人工自旋冰基磁子晶体存在两个普遍障碍：人工自旋冰的磁性状态难以重新配置，纳米岛之间的静磁相互作用通常很弱，阻碍了模式耦合。我们使用微磁建模证明，将由弱相互作用纳米磁体制成的可重构人造自旋冰几何结构耦合到软磁底层，创建了一个表现出动态耦合模式的复杂系统。基于人工自旋冰磁态，这些在底层中以明确的频率产生自旋波通道，并且可以重新配置。这些发现为实现可重构磁振子晶体打开了大门，该晶体在基于磁振子的逻辑架构中具有数据传输和处理的潜在应用。
Artificial spin ices are ensembles of geometrically arranged interacting nanomagnets that have shown promising potential for the realization of reconfigurable magnonic crystals. Such systems allow for the manipulation of spin waves on the nanoscale and their potential use as information carriers. However, there are presently two general obstacles to the realization of artificial spin-ice-based magnonic crystals: the magnetic state of artificial spin ices is difficult to reconfigure and the magnetostatic interactions between the nanoislands are often weak, preventing mode coupling. We demonstrate, using micromagnetic modeling, that coupling a reconfigurable artificial spin-ice geometry made of weakly interacting nanomagnets to a soft magnetic underlayer creates a complex system exhibiting dynamically coupled modes. These give rise to spin-wave channels in the underlayer at well-defined frequencies, based on the artificial spin-ice magnetic state, which can be reconfigured. These findings open the door to the realization of reconfigurable magnonic crystals with potential applications for data transport and processing in magnonic-based logic architectures.