Politecnico di Torino (logo)

Modeling of Spin Wave based majority gate

Rossella Stefanelli

Modeling of Spin Wave based majority gate.

Rel. Fabrizio Giorgis. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Elettronica (Electronic Engineering), 2019

PDF (Tesi_di_laurea) - Tesi
Licenza: Creative Commons Attribution Non-commercial No Derivatives.

Download (3MB) | Preview

The improvement of CMOS technology reaches some fundamental limitations. For this reason alternatives are necessary to overcome the scaling and performances issues of the standard electronics. One of these is spintronic, in particular the subgroup of magnonics, since its main advantage is the power efficient computation. Indeed these devices exploit the spin as information carrier, rather than the charge, hence there is no Joule heating. Furthermore magnonic devices allow wave computing with higher functionality than classic computing. The goal of this master thesis is to study the majority gate device with different operating mode: continuous and pulse regime. The modeling of the system is performed through micromagnetic simulations, hence it has been possible to characterize the spin waves behaviour, thanks to the computation of the fundamental parameters describing their propagation in this specific device (chapter 4). The obtained dispersion relations suggest that even if the waveguide is set on DE geometry, also BWV waves are present, because the system is non uniformly magnetized. As a consequence the majority gate is far from the ideal condition and this leads to important consequences on the performances of the device, as it will be explained in the chapter 5. Then the successive step is the study of the interference pattern if more than one inputs are applied. Relevant differences are found between the two operation regime (chapter 6). The pulse mode arouses particular interest, since usually an electronic device has to work with a clock scheme, hence the excitation applied has a limited duration. The computation efficiency changes depending on the shape of signal exploited as input. The Gaussian field is meant to offer the best performances, even if the goal of the research is to find an efficient operation mode applying rectangular pulses. From the comparison between Gaussian and rectangular excitation mode it has been found that in the second case more harmonics are present, as it is suggested by the Fourier Transform of the signal, leading to unwanted results.

Relators: Fabrizio Giorgis
Academic year: 2019/20
Publication type: Electronic
Number of Pages: 99
Corso di laurea: Corso di laurea magistrale in Ingegneria Elettronica (Electronic Engineering)
Classe di laurea: New organization > Master science > LM-29 - ELECTRONIC ENGINEERING
Ente in cotutela: KUL - Katholieke Universiteit Leuven (BELGIO)
Aziende collaboratrici: IMEC
URI: http://webthesis.biblio.polito.it/id/eprint/12554
Modify record (reserved for operators) Modify record (reserved for operators)