Abstract
We present a theory of a surface barrier for isolated solitons to enter chiral magnets, in an analogous way to that of the Bean-Livingston barrier in the type II superconductors. With this theory, we discuss hysteresis observed in magnetoresistance (MR) measurements of monoaxial chiral helimagnet . We argue that a large jump in the decreasing field process of MR of micrometer-sized samples is due to the disappearance of the surface barrier for the chiral soliton at a field . This argument is justified through agreement between the experimental results at 10 K and our theoretical result (with thermodynamic critical field ) based on the sine-Gordon model.
- Received 31 December 2017
- Revised 8 May 2018
DOI:https://doi.org/10.1103/PhysRevB.97.214413
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