基于极化自旋波的超导磁逻辑
Purely magnetic logic based on polarized spin waves
摘要：
自旋波是磁性材料中磁序的进动，是一种携带自旋角动量的集体激发。类似于声波或光波，自旋波也具有偏振自由度。尽管这种极化自由度在铁磁体中被冻结，但在反铁磁体或亚铁磁体中它们是完全解锁的。在这里，我们介绍了磁门的概念，并演示了自旋波模拟的反铁磁体中的Datta-Das自旋晶体管。利用极化自旋波与反铁磁畴壁的相互作用，我们提出了一种在单一磁结构中实现所有布尔运算的纯磁性通用逻辑门。我们进一步构建了一个全功能的4位算术逻辑单元，只使用16个自旋波通用逻辑门，在一个织布机编织的方式操作。本文提出的基于自旋波的体系结构也为未来的节能非易失性计算、分布式内存处理计算和可进化神经形态计算提供了一个模型。
英文摘要：
Spin wave, the precession of magnetic order in magnetic materials, is a collective excitation that carries spin angular momentum. Similar to the acoustic or optical waves, the spin wave also possesses the polarization degree of freedom. Although such polarization degrees of freedom are frozen in ferromagnets, they are fully unlocked in antiferromagnets or ferrimagnets. Here we introduce the concept of magnetic gating and demonstrate a spin wave analog of the Datta-Das spin transistor in antiferromagnet. Utilizing the interplay between polarized spin wave and the antiferromagnetic domain walls, we propose a universal logic gate of pure magnetic nature, which realizes all Boolean operations in one single magnetic structure. We further construct a full functional 4-bit Arithmetic Logic Unit using only sixteen spin wave universal logic gates, operating in a weaving fashion as a Jacquard loom machine. The spin wave-based architecture proposed here also sets a model for the future energy efficient non-volatile computing, the distributed processing-in-memory computing, and the evolvable neuromorphic computing.
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