Current-induced bulk magnetization of a chiral crystal CrNb_3S_6

摘要

Current-induced magnetization has been investigated in a monoaxial chiral crystal CrNb_3S_6 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.