Modulating Propagating Characteristics And Its Application Of Spin Wave In Magneto-dielectric Waveguide

The advancement of modern information technology has made semiconductor-based devices and digital logic circuits approaching their quantum limits.Further reductions in device size can lead to quantum effects that severely degrade device and circuit performance.Therefore,new solutions are urgently needed to meet the needs of modern information systems.Schemes using spin waves as information carriers are considered to be the most promising candidates.The design of spin wave logic devices is mainly based on the interference effect of spin waves.The phase control of spin waves has become the main direction of spin wave logic device design.At present,most spin wave devices are designed based on Damon–Eshbach spin waves(DESW),which is due to the higher application frequency band and better surface confinement of DESW.However,the excitation of DESW usually requires an external magnetic field along the width of the waveguide.The existence of external magnetic field will greatly reduce the modulation efficiency of DESW.Therefore,how to efficiently excite DESW and accurately phase control of spin waves has become the focus of this thesis.The main research contents of this thesis include:(1)At present,most spin wave phase shifters will cause the decrease of spin wave amplitude and low phase shifting efficiency.The spin wave phase shifter based on dipole interaction can indirectly modulate the propagation characteristics of spin wave,so as to complete the phase shift function efficiently on the premise of low spin wave loss.(2)Aiming at the problem that the existence of external field will greatly reduce the modulation efficiency of DESW,the shape induced anisotropy in the corrugated waveguide with specific structure can act as the role of external magnetic field and effectively excite DESW.Through experiment and simulation,the influence of the structural parameters of corrugated waveguide on the anisotropy and spin wave propagation characteristics of corrugated waveguide is explored1.The spin wave phase shifter proposed in this thesis is designed based on the dipole interaction between magnetic materials,and its phase shift is related to the magnetic parameters and structural parameters of magnetic materials.It is found that when the Co length is 970 nm,the gap of materials is 110 nm and the excitation frequency is 4.60 GHz,the de mode spin wave can realize ? phase shift.By adjusting the relative direction of magnetic moments of Co and YIG,the modulation of phase shift from 0 to ? can be realized.2.Based on the relationship between phase shift and magnetic material parameters,the spin wave phase shifter with adjustable phase shift utilizing the SOT effect is proposed,and the broadband spin wave XOR logic gate with operating frequency of 4.40 ? 4.60 GHz is designed.3.In the spin wave waveguide,the corrugated structure is used to induce anisotropy.The influence of the structural parameters of the corrugated waveguide on the anisotropy of the corrugated waveguide is explored in detail.The research shows that the anisotropy is positively correlated with the wavelength and amplitude of the corrugated waveguide and negatively correlated with the thickness of the film.In this thesis,aiming at the two key problems in the development of spin wave logic gate,the effects of the morphology of corrugated waveguide on its anisotropy and spin wave propagation characteristics are studied,and a new design of broadband spin wave XOR logic gate is proposed.These studies not only provide new ideas for the design of spin wave logic gates,but also promote the development of spin wave devices in the future.