Excitation of vortices using linear and nonlinear magnetostatic waves
  It is shown that stationary vortex structures can be excited in a ferrite film. This is the first proposal for creating vortex structures in the important cm and mm wavelength ranges. It is shown that both linear and nonlinear structures can be excited using a three-beam interaction created with circular antennae. These give rise to a special phase distribution created by linear and nonlinear mixing. An interesting set of three clockwise rotating vortices joined by one counter-rotating one presents itself in the linear regime: a scenario that is only qualitatively changed by the onset of nonlinearity. It is pointed out that control of the vortex structure, through parametric coupling, based upon a microwave resonator, is possible and that there are many interesting possibilities for applications. 
Allan D. Boardman, Yuriy G. Rapoport, V. V. Grimalsky, B.A. Ivanov, S.   V. Koshevaya, Larry Velasco, C. E. Zaspel