Speaker
Description
Quasicrystals exhibit long range order but an absence of translational invariance, and therefore, quasicrystals possess non-identical local environment. In our studies we fabricated artificial ferromagnetic quasicrystals (AFQs) made of 19 nm thick CoFeB film with nanoholes in an arrangement of Penrose tiling, and investigated collective spin excitations by means of broadband spin-wave spectroscopy in the few GHz frequency regime. We detected different sets of spin wave eigenmodes, which displayed a ten-fold rotational symmetry in angle dependent studies and reflected the quasicrystalline nature of lattices. Using micromagnetic simulations, we identified characteristics spin-wave motifs within the aperiodic AFQ lattice . The work was supported by SNSF via grant number 163016.
