Propagation of centimeter and millimeter spin-dipolar waves in nonuniform magnetic fields
DOI:
https://doi.org/10.3103/S0735272709030078Abstract
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.
References
P. E. Wigen, Nonlinear Wave Phenomena and Chaos in Magnetic Materials (World Scientific, Singapore, 1994).
A. A. Serga, S. O. Demokritov, B. Hillebrands, and A. N. Slavin, “Self-Generation of Two-Dimensional Spin-Wave Bullets,” Phys. Rev. Lett. 92, No. 11, 11203 (2004).
B. A. Kalinikos and A. N. Slavin, “Generation of Short Millimeter-Wave Radio Pulses Using Solitons in Ferrite-Based Active Rings,” Appl. Phys. Lett. 79, No. 10, 1576 (2001).
M. M. Scott, B. A. Kalinikos, and C. Patton, “Self-Generation of Bright Microwave Magnetic Envelope Soliton Trains in Ferrite Films through Frequency Filtering,” Appl. Phys. Lett. 78, No. 7, 970 (2001).
A. G. Gurevich an G.A. Melkov, Маgnetization Oscillations and Waves (Fizmatgiz, Moscow, 1994; CRC Press, Boca Raton, CA, 1996).
R. Khomeriki and L. Tkeshelashvili, “Stable Magnetostatic Solitons in Yttrium Iron Garnet Film Waveguides for Tilted in-Plane Magnetic Fields,” Phys. Rev. B 65, No. 13, Paper 134415 (2002).
A. V. Vashkovskiy and E. G. Lokk, “Forward and Backward Noncollinear Waves in Magnetic films,” Physics—Uspekhi 49, No. 5, 537 (2006).
V. I. Zubkov and V. I. Scheglov, “Stochastic Instability of the Magnetostatic Surface Wave Trajectories in a Ferrite Film Magnetized by a Modulated Field with a Banklike Profile,” Tech. Phys. Lett. 27, No. 8, 348 (2001).
Yu. A. Kravtsov and Yu. I. Orlov, Geometrical Optics of Inhomogeneous Media (Springer, N.Y., 1990).
O. Bittner, M. Bauer, S. O. Demokritov, et al., “Linear and Nonlinear Diffraction of Dipolar Spin Waves in Yttrium Iron Garnet Films Observed by Space- and Time-Resolved Brillouin Light Scattering,” Phys. Rev. B 61, No 17, 11576 (2000).
