Direct observation of the temperature dependence of the Dzyaloshinskii-Moriya interaction

In this work, we investigate the temperature dependence of the Dzyaloshinskii-Moriya interaction (DMI) in Co/Pt thin film by observing the asymmetric spin-wave dispersion using Brillouin light scattering. The DMI constant D reduce monotonously with the temperature increasing from room temperature to 393 K. By extracting the saturation magnetization M (s) and the uniaxial anisotropy K (u), we find that D(T) proportional to K (u) (T)(2.08 +/- 0.13) and D(T) proportional to M (s) (T)(5.25 +/- 0.33). These observations indicate that temperature is a possible way to control the DMI. On the other hand, the temperature dependence of DMI in thin films may have significant influence for potential applications.