METHOD FOR EXCITATION OF STANDING SPIN WAVES IN NANOSTRUCTURED EPITAXIAL FERRITE GARNET FILMS USING FEMTOSECOND LASER PULSES Russian patent published in 2022 - IPC H01P1/19 B82Y30/00 C23C26/00 

FIELD: nanotechnology.

SUBSTANCE: invention relates to the field of spintronics and ultrahigh frequency technology and, in particular, to the creation of optically controlled filters, modulators and routers of microwave radiation, logic elements and signal converters based on epitaxial films of ferrite garnets. The method for local, limited by the diffraction limit, excitation of standing spin waves in a nanostructured epitaxial ferrite garnet film obtained on a gadolinium gallium garnet substrate using femtosecond pulsed coherent laser linearly polarized radiation includes the following operations. The profile of the epitaxial ferrite garnet film is made in the form of a one-dimensional lattice with a rectangular meander cross section by means of nanolithography and the said substrate with a ferrite garnet film is placed in an external permanent magnetic field with a strength of 5-2000 E. The surface of an epitaxial nanostructured ferrite garnet film of the specified profile is irradiated with femtosecond pulsed coherent linearly polarized laser radiation, providing excitation of standing spin waves. The wavelength of the exciting radiation is 400-1500 nm, the pulse duration is 50-500 fs and the repetition frequency is up to 0.2 GHz. The efficiency and speed of dynamic optomagnetic spin dynamics control for excitation of standing spin waves in magnetic epitaxial films of ferrite garnets are improved, the frequency and order of excited CERS can be adjusted when the magnitude of the external magnetic field and the parameters of the exciting radiation change, as well as the fundamental possibility of excitation and registration of CERS in an ultra-small region of the sample comparable to the diameter of the laser focus spot while the size of the excitation region is physically limited by the diffraction limit.

EFFECT: expansion of the range of methods for excitation of standing spin waves in nanostructured epitaxial ferrite garnet films.

1 cl, 4 dwg