Ferromagnetic resonance

FMR allows us to study the magnetic relaxation of ferromagnetic films and doped topological insulators, giving information on interlayer coupling, internal damping mechanisms and spin pumping. This sophisticated technique uses a Vector Network Analyser to pass microwaves in the GHz range across our samples and measure absorption. When the microwaves are in resonance with the precession of magnetic moments within the sample they are absorbed more strongly. This absorption is affected by factors such as magnetisation of the sample or the orientation of magnetocrysalline easy axes, and we access such information by fitting functions to the data.