Interfacial Dzyaloshinskii-Moriya Interaction in Pt/CoFeB Films: Effect of the Heavy-Metal Thickness

Dzyaloshinskii-Moriya interaction (DMI), i.e., the antisymmetric exchange interaction, is the subject of intense research due to its capability to induce the formation of chiral spin textures, such as magnetic Skyrmion lattices and spin spirals. In ultrathin ferromagnetic (FM) films in contact with a nonmagnetic heavy metal (HM), a noticeable interfacial DMI can arise due to the large spin-orbit coupling in the presence of the broken inversion symmetry at the FM/HM interface, leading to an asymmetric spin-wave dispersion.

Transition from Hydrodynamic to Viscoelastic Propagation of Sound in Molten RbBr

The departure from the hydrodynamic regime in liquids is subject of a continuous research in order to provide an experimental support to liquid state theories, which are much are harder to develop respect to the crystal and gas counterpart. We have used the neutron spectrometer BRISP@ILL to apply the neutron scattering Brillouin technique to molten RbBr at THz frequencies and nm length scale.