Thin ferromagnetic films with periodically patterned holes have been shown through laboratory experiments and simulations to exhibit rich ferromagnetic resonance spectra. Stories of the origin of these multiple resonances abound. We will present our own data taken on these hole arrays and describe the excitations in the context of a spin wave (or magnon) theory that combines both magnetostatic effects and exchange. The goal being to show that the wavelength of the excited spin waves is controlled by the patterned periodicity of the hole lattice. Finally, we will describe an interesting experiment where utilization of this spin wave control could be used to create a Bose-Einstein condensate of magnons.
Wednesday, November 9th at Noon
Room F235, Technological Institute
