Dr. Johannes Cremer

Johannes is interested in microscopic magnetism in solids, which is emerging from strongly coupled spins in thin films. The resulting dynamics on the nano- to microscale contain rich physics resulting from strong non-linear processes. One particular example is self scattering of magnons (spin waves) in magnetic insulators, which yield high temperature quasiparticle gases and coherently mixed states. 

Additionally interactions at the interface can pin magnetization which scatters magnons and allows for both control of their propagation as well as extraction of interfacial order between the magnon carrier material and samples under test.