Abstract
A theory is developed for the collinear TE-TM scattering of optical waveguide modes on dipoleexchange spin waves in perpendicularly magnetized ferromagnetic films that are inhomogeneous across their thickness. It is found in homogeneous ferromagnetic films and in films with small deviations from homogeneity that the TE-TM scattering on higher spinwave modes is strongest when the synchronism conditions for the transverse phases and for the longitudinal and transverse wave vectors are satisfied. When the thickness of the planar optical waveguide does not match the thickness of the ferromagnetic film, the phase synchronism condition is violated with the resultant appearance of an oscillating type of dependence of the TE-TM scattering on the spin-wave mode number. The scattering of light on spin-wave modes in films with a magnetization gradient is investigated in the presence of turning points for the magnetostatic potential. It is found that the existence of a turning point in the region of the antinode for the optical modes leads to an increase in the scattering amplitude. The formation of inhomogeneous magnetooptical structures and superlattices based on (Lu,Y,Bi)3(Fe,Ga)5O12 is discussed.
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Zh. Tekh. Fiz. 68, 78–84 (June 1998)
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Lutsev, L.V. Collinear light scattering on dipole-exchange spin waves in inhomogeneous ferromagnetic films. Tech. Phys. 43, 685–690 (1998). https://doi.org/10.1134/1.1259054
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DOI: https://doi.org/10.1134/1.1259054