2021 Fiscal Year Annual Research Report
Research on Spin Wave interference device for Quantum computation application
| Project/Area Number |
21J12725
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SARKER MD SHAMIM 東京大学, 工学系研究科, 特別研究員(DC2)
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| Project Period (FY) |
2021-04-28 – 2023-03-31
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| Keywords | マグノニクス / スピン波 / マイクロ波特性評価 |
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| Outline of Annual Research Achievements |
As my research goal is the implementation of magnonic control and magnonic interference measurement for logic and sensing application. In the last year I have done study about optimization study for creating magnonic microstructure using lithography and wet chemical etching process using. During optimization process, we had observed that the resonance spin wave frequency strongly depends on the ratio of length and width of magnonic bar. This ratio determine the anisotropic field and control the SWs frequency. We can use this technique for propagating the multiple frequency in the same ferromagnetic substrate under the same bias magnetic field for parallel data processing. Further we have studied the magnonic interference in cross-bar device where 2 different type of spin waves named magnetostatic surface wave and backward volume wave propagating in orthogonal arm interfere with each other and depending on the phase of incoming waves, they makes constructive and destructive interference. This structure can be used for X-NOR logic gates. We also have implemented the active controlling of the interference pattern using the current induced temperature gradient. I am summarizing the article about it. We also have implemented the inline interference device instead of cross-bar which can operates on the similar type of spin waves (MSSW) bypassing the requirement of frequency overlapping of cross bar. Furthermore, spin waves controlling in YIG/CoFeB heterostructure has been implemented and proposed as the magnetic sensor.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The target of my first year research is to basic characterization of spin waves in microstructure and do experiment on interference. Which have been achieved already and I am summarizing the article on it. I also have implemented a basic control over spin waves interference. Spin wave control by polymer structure has been implemented separately. Now the remaining goal is to integrate the spin waves interference device and spin wave controlling technique together for implementing the noble computing device which will be achieved in next year. That is why I choose“generally progressing steadily”
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| Strategy for Future Research Activity |
We have successfully implemented the crossbar interference device with microstructure YIG crossbar and have modulated it by current induced Joule heating. We also have demonstrated the inline interference spin waves device which shows better contrast between constructive and destructive interference than the cross-bar structure. Here are my research implementation plan of this fiscal year:
April-May: I shall do systematic analysis and the theoretical validation of the reconfigurable cross-bar spin waves interference device with dc current and submit the article.
May-June: I have implemented a special spin waves bus structure with discontinued YIG bus for addressing the non-reciprocity. I have applied this result to inline interference device and obtained better performance. I shall verufy that result and summarize the article.
July-November: I shall focus on the YIG/PEDOT:PSS magnon FET structure. I shall do some systematic analysis to reveal the underline the physics behind my previous data of SWs modulation by electric field. I shall extend my research about magnon FET towards the solid electrolyte. I am going to use Li3PO4/YIG heterostructure to utilize its faster ionic switching response in the spin waves controlling. I Shall also combine the magnon control and interference device for on chip calculation purpose.
December-February: I shall mostly write my PhD thesis dissertation and prepare myself for the defense. I will need to do some additional experiment to complete the stories of my thesis. I will also prepare some pending article during that time.
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