Conduction of spin currents in disordered insulating antiferromagnets has recently been at the center of scientific debate with both long-range spin transport or no spin transport at all observed experimentally. In this study, ferromagnetic resonance has been used to probe the transmission of ac spin current through thin amorphous yttrium iron garnet (YIG) layers. The spin current is found to be mediated by evanescent spin waves with a penetration length four times larger than that of previous studies of amorphous YIG, even exceeding the spin penetration length of crystalline NiO.

中文翻译：

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通过非晶磁绝缘体增强磁振子传输

无序绝缘反铁磁体中自旋电流的传导最近成为科学争论的中心，实验中观察到长程自旋输运或根本没有自旋输运。在这项研究中，铁磁共振被用来探测交流自旋电流通过薄非晶钇铁石榴石（YIG）层的传输。研究发现，自旋电流是由渐逝自旋波介导的，其穿透长度是之前非晶 YIG 研究的四倍，甚至超过了晶体 NiO 的自旋穿透长度。