Current-induced bulk magnetization of a chiral crystal CrNb3S6
Current-induced bulk magnetization of a chiral crystal CrNb3S6
复制标题
DOI：
10.1063/5.0017882
复制
发表时间：
2020-08-03
影响因子：
4
通讯作者：
Yamamoto, Hiroshi M.
中科院分区：
文献类型：
--
作者：
Nabei, Yoji;Hirobe, Daichi;Yamamoto, Hiroshi M.
用超导量子干涉仪研究了单轴手征晶体CrNb_3S_6的电流感生磁化。我们发现，通过施加沿着主轴的单轴手征晶体的体磁化，并与电流的磁化强度线性变化。直接检测这种磁化使人们能够估计自旋极化电子的数量。使用这个数字，我们评估的自旋极化率的玻尔兹曼方程的框架内。我们还观察到在顺磁相和受迫铁磁相之间的相界附近，电流感生磁化强度增加，这可以归因于自旋涨落的增强。我们讨论了这些观察的基础上的手性诱导的自旋选择性交换相互作用增强的效果。
Current-induced magnetization has been investigated in a monoaxial chiral crystal CrNb3S6 by means of superconducting quantum interference device magnetometry. We found that bulk magnetization was generated by applying electric current along the principal axis of the monoaxial chiral crystal and that the magnetization changed linearly with the current. Directly detecting such magnetization enables one to estimate the number of spin-polarized electrons. Using this number, we evaluated the spin polarization rate within the framework of Boltzmann's equation. We also observed that the current-induced magnetization increased in the vicinity of the phase boundary between paramagnetic and forced ferromagnetic phases, which could be attributed to the enhancement of spin fluctuation. We discuss these observations based on a chirality-induced spin selectivity effect enhanced by exchange interactions.