Nonlinear Ultrafast Spin Scattering in the Skyrmion Phase of Cu2OSeO3

作者：Langner M C^*; Roy S; Huang S W; Koralek J D; Chuang Y D; Dakovski G L; Turner J J; Robinson J S; Coffee R N; Minitti M P; Seki S; Tokura Y; Schoenlein R W

来源：Physical Review Letters, 2017, 119(10): 107204.

DOI：10.1103/PhysRevLett.119.107204

Ultrafast x-ray scattering studies of the topological Skyrmion phase in Cu2OSeO3 show the dynamics to be strongly dependent on the excitation energy and fluence. At high photon energies, where the electron-spin scattering cross section is relatively high, the excitation of the topological Skyrmion phase shows a nonlinear dependence on the excitation fluence, in contrast to the excitation of the conical phase which is linearly dependent on the excitation fluence. The excitation of the Skyrmion order parameter is nonlinear in the magnetic excitation resulting from scattering during electron-hole recombination, indicating different dominant scattering processes in the conical and Skyrmion phases.

• 出版日期2017-9-7
• 单位RIKEN