Propagation of Centimeter and Millimeter Spin-Dipolar Waves in Nonuniform Magnetic Fields

摘要

Propagation of exchangeless spin-dipolar waves (SDW) of centimeter (f ～ 3-20 GHz) and millimeter (f ～ 30-60 GHz) wavelength ranges in ferrite films into nonuniform magnetic fields was researched analytically and numerically. Applied magnetic field is directed along film plane and it is slightly nonuniform in this plane. Proposed SDW propagation in magnetic fields was researched with complex geometric optics. We have shown a possibility of SDW type transformation from superficial SDW into backward volume SDW along propagation trajectory in both centimeter and millimeter wavelength range. An influence of electromagnetic delay on SDW propagation in nonuniform magnetic fields is essential in millimeter wavelength range and it can modify wave trajectories.