Spin Waves Interference under Excitation by Focusing Transducers: Logic and Signal Processing
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XVIII INTERNATIONAL SYMPOSIUM “NANOSTRUCTURES: PHYSICS AND TECHNOLOGY”, MINSK, REPUBLIC OF BELARUS, SEPTEMBER, 2020. SPIN RELATED PHENOMENA IN NANOSTRUCTURES
Spin Waves Interference under Excitation by Focusing Transducers: Logic and Signal Processing M. Madamia,*, G. Gubbiottib,**, Y. V. Khivintsevc,d,***, G. M. Dudkoc,****, V. K. Sakharovc,*****, A. V. Kozhevnikovc,******, Y. A. Filimonovc,d,e,*******, and A. G. Khitunf,******** a
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Dipartimento di Fisica e Geologia, Università di Perugia, via A. Pascoli, Perugia, I-06123 Italy Istituto Officina dei Materiali del CNR (CNR-IOM), sede secondaria di Perugia, c/o Dipartimento di Fisica e Geologia, Università di Perugia, Perugia, I-06123 Italy c Kotelnikov Institute of Radioengineering and Electronics, Saratov Branch, Saratov, Russia d Chernyshevsky Saratov State University, Saratov, Russia e Yuri Gagarin State Technical University of Saratov, Saratov, Russia f University of California-Riverside, Riverside, California, 92521 USA *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] ****e-mail: [email protected] *****e-mail: [email protected] ******e-mail: [email protected] *******e-mail: [email protected] ********e-mail: [email protected] Received June 23, 2020; revised July 23, 2020; accepted July 27, 2020
Abstract—Micro-focused Brillouin–Mandelstam light scattering technique and micromagnetic simulations were used to study surface (SSW) and backward volume (BVSW) spin waves (SW) interference under excitation by curvilinear focusing transducers placed oppositely to each other on a top of a tangentially magnetized yttrium iron garnet (YIG) film. It is shown that due to anisotropic propagation, the 2D interference patterns for both SSW and BVSW focused beams are nonreciprocal. Due to chromatic aberration and caustics formation of the focusing transducers, the interference pattern of the focused SW beams depends on the excitation frequency and is sensitive to local nonuniformities in the YIG film. The obtained results demonstrate the possibility to use curvilinear SW focusing transducers for information technologies based on magnonic optics. Keywords: spin waves interference, spin waves focusing transducer, logic and signal processing DOI: 10.1134/S1063782620120192
1. INTRODUCTION Spin waves (SW) interference phenomena in magnetic microstructures are being actively studied because of the prospect of building energy-efficient logic devices based on the principles of magnonics [1, 2]. Additionally, computing algorithms which exploit interference pattern formation between coherent wavefronts were proposed to implement non-Boolean computation, [3] for special data processing such as pattern recognition [4], spectrum analysis [5] and to perform spin-wave Fourier optics [6, 7]. Such ideas stimulate efforts to integrate optic-like components (prisms, lenses, mirrors, splitters) into magnetic films to perform SW based signal processing directly on-
chip [8, 9] in view of spin-wave optical applications. It is accomp
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