PHASE PROFILES OF MICROWAVE MAGNETIC ENVELOPE SOLITONS

A new method for the analysis of microwave magnetic envelope (MME) sol itons has been developed. This method is based on the determination an d analysis of output microwave pulse phase profiles. Simple analytical results based on the nonlinear Schrodinger equation show that MME sol iton phase profiles contain the necessary and sufficient information n eeded to define a particular pulse as a linear dispersive pulse or a f ully formed soliton. The effects are demonstrated both theoretically a nd experimentally for magnetostatic backward volume wave and magnetost atic surface wave pulse signals. Theoretical phase profiles are consid ered for Gaussian, hyperbolic secant, and rectangular pulse shapes. Ex perimental profiles are obtained for rectangular input pulses. The mea sured phase profiles compare favorably with the numerical results. Bot h the data and the theory show that a constant phase profile across th e pulse provides a consistent and quantitative criterion for an MME so liton. (C) 1998 American Institute of Physics.