BAGEP 2017 Awards – Mehmet Cengiz Onbaşlı
According to Eric Schmidt, the chairman of Alphabet (Google), more data are generated in two days than the data amount generated until 2003 since information started being recorded. There is a need to transfer increasing volume of data from wide bandwidth channels for applications such as internet-of-things and there is also a need for processing and recording information in small chips at or above 5 GHz clock frequencies. Si CMOS (complementary metal-oxide semiconductor) technology previously met the growing computational need by shrinking transistor sizes, however, due to current transistor sizes and the associated prohibitively high production costs, this approach is no longer going to be able to meet the growing computational demand. In order to meet the computational needs which are not met by state-of-the-art technologies, we plan to develop and use spintronic materials for both data storage as well as experimental data processing between 5 GHz – 7 THz.
To achieve this purpose, magnetic insulator thin films such as (YIG, Y3Fe5O12) and TmIG (Tm3Fe5O12) that do not cause Ohmic dissipation are going to be used. Using magnons which are spin-wave particles, data are going to be transferred to each data storage bit for reading and writing. Magnons do not include electron charge currents. In our three-stage research program, we first focus on modeling and experimentally demonstrating spintronic waveguides for 2 GHz – 7 THz. In the second stage, we model and fabricate interferometric spin-logic circuits (AND, OR, NOT gates). In the third stage, data storage elements such as multiferroic (BaTiO3/Co), spin-orbit torque structures (Pt/Co/AlOx), spin-transfer torque structures (YIG/Pt/magnetoelectric oxide) or 2D-spintronic (YIG/WSe2) structures are going to be fabricated and their data reading and writing characteristics are going to be tested.