Transformation of spin current by antiferromagnetic insulators
Transformation of spin current by antiferromagnetic insulators
复制标题
DOI：
10.1103/physrevb.93.224421
复制
发表时间：
2016-06-22
影响因子：
3.7
通讯作者：
Ivanov, Boris A.
中科院分区：
文献类型：
--
作者：
Khymyn, Roman;Lisenkov, Ivan;Ivanov, Boris A.
从理论上证明了各向异性反铁磁（AFM）绝缘体薄层可以通过激发一对倏逝的AFM自旋波模式有效地传导自旋电流。由于受激AFM模式与AFM晶格之间的相互作用，流过AFM的自旋电流不守恒，并且根据激发条件的不同，可以衰减或增强。当激发的倏逝模式之间的相位差接近pi/2时，存在一个最佳的AFM厚度，此时输出自旋电流达到最大值，可以显著超过输入自旋电流的大小。通过AFM的自旋电流传输取决于环境温度，当温度接近AFM层的尼尔温度时，自旋电流传输显著增加。
It is demonstrated theoretically that a thin layer of an anisotropic antiferromagnetic (AFM) insulator can effectively conduct spin current through the excitation of a pair of evanescent AFM spin wave modes. The spin current flowing through the AFM is not conserved due to the interaction between the excited AFM modes and the AFM lattice and, depending on the excitation conditions, can be either attenuated or enhanced. When the phase difference between the excited evanescent modes is close to pi/2, there is an optimum AFM thickness for which the output spin current reaches a maximum, which can significantly exceed the magnitude of the input spin current. The spin current transfer through the AFM depends on the ambient temperature and increases substantially when temperature approaches the Neel temperature of the AFM layer.