Taro Nakajima, Yasuhiro Inamura, Takayoshi Ito, Kazuki Ohishi, Hiroshi Oike, Fumitaka Kagawa, Akiko Kikkawa, Yasujiro Taguchi, Kazuhisa Kakurai, Yoshinori Tokura, and Takahisa Arima
We investigated the phase-transition kinetics of magnetic skyrmion lattice (SkL) in MnSi by means of stroboscopic small-angle neutron scattering (SANS). Temporal evolutions of SANS patterns were measured with time resolution of 13 ms while sweeping temperature as fast as 50Ks−1. It turned out that the paramagnetic-to-SkL transition immediately occurs upon traversing the equilibrium phase boundary on the rapid cooling, whereas the SkL-to-conical transition can be kinetically avoided to realize the low-temperature metastable SkL with a long-range magnetic order. The formation of the metastable SkL was found to be strongly dependent not only on cooling rate, but also on magnetic field and trajectory in the H−T phase diagram.
Physical Review B : https://journals.aps.org/prb/abstract/10.1103/PhysRevB.98.014424