Magnetoresistance measurements in a chiral magnet CrNb$_{3}$S$_{6}$ subject to locally applied magnetic field

CrNb$_{3}$S$_{6}$ is one of interesting magnetic materials with structural chirality, wherein chiral magnetic orders are formed as a consequence of the competition between Heisenberg exchange and antisymmetric Dzyaloshinsky-Moriya (DM) interactions. Interestingly, a chiral helimagnetic order appears as the ground state at zero magnetic field, while it transforms into a chiral spin soliton lattice; a spin superlattice of forced ferromagnetic regions partitioned by a soliton with $2\pi $ rotation of spin magnetic moments, in the presence of magnetic field applied perpendicular to the chiral structural axis [1]. In this work, we have investigated the magnetoresistance (MR) in a micro-fabricated single crystal of CrNb$_{3}$S$_{6}$ by means of the standard ac transport measurement. We have found that the MR exhibits a hysteresis behavior during the magnetic field cycle, although a continuous negative MR is observed in a bulk single crystal [2]. In the presentation, we will show the MR changes induced by locally applied magnetic field and discuss their properties in terms of the macroscopic coherence of the chiral spin soliton lattice.\\[4pt] [1] Y. Togawa et al., Phys. Rev. Lett. 108, 107202 (2012).\\[0pt] [2] Y. Togawa et al., Phys. Rev. Lett. 111, 197204 (2013).