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磁性量子元胞自动机拐角结构的理论模拟和实验
Theoretical study and experimentation of magnetic quantum-dot cellular automata corner structure
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摘要: 磁性量子元胞自动机拐角结构是一种同时含有铁磁耦合和反铁磁耦合的电路.理论模拟了外加时钟场作用下铸铁磁性材料拐角结构的信号传递.采用微磁仿真给出了信号传递的磁化演化图,结果证实了铸铁纳磁体能够实现含有两种冗长耦合结构的稳定转换.实验制备了相应的拐角结构,扫描电子显微图和磁力显微图结果显示了成功的电路图案和正确的两种耦合方式信号传递.Abstract: Magnetic quantum-dot cellular automata （MQCA） comer structure consists of both ferromagnetic coupling and anti-ferromagnetic coupling. Signal propagation of comer structure for magnetic material Fe is theoretically investigated by applying an external clocking field method. Magnetization evolution image on signal propagation of the comer is presented by micromagnetic simulation; it is shown that Fe nanomagnets can ensure stable switching of comer including two kinds of lengthy coupling. The proposed comer structure is then fabricated by electron beam lithography, thermal evaporation and lift-off technologies. Scanning electron microscopy and magnetic force microscopy measurement results demonstrate perfect pattern and correct signal propagation of two types of coupling.
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