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Classification tasks using input driven nonlinear magnetization dynamics in spin Hall oscillator
Citation
Mohan, J. R., Mathew, A. J., Nishimura, K., Feng, R., Medwal, R., Gupta, S., Rawat, R. S., & Fukuma, Y. (2023). Classification tasks using input driven nonlinear magnetization dynamics in spin Hall oscillator. Scientific Reports, 13, Article 7909. https://doi.org/10.1038/s41598-023-34849-7
Author
Mohan, John Rex
•
Mathew, Arun Jacob
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Nishimura, Kazuma
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Feng, Ruoyan
•
Medwal, Rohit
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Gupta, Surbhi
•
•
Fukuma, Yasuhiro
Abstract
The inherent nonlinear magnetization dynamics in spintronic devices make them suitable candidates for neuromorphic hardware. Among spintronic devices, spin torque oscillators such as spin transfer torque oscillators and spin Hall oscillators have shown the capability to perform recognition tasks. In this paper, with the help of micromagnetic simulations, we model and demonstrate that the magnetization dynamics of a single spin Hall oscillator can be nonlinearly transformed by harnessing input pulse streams and can be utilized for classification tasks. The spin Hall oscillator utilizes the microwave spectral characteristics of its magnetization dynamics for processing a binary data input. The spectral change due to the nonlinear magnetization dynamics assists in real-time feature extraction and classification of 4-binary digit input patterns. The performance was tested for the classification of the standard MNIST handwritten digit data set and achieved an accuracy of 83.1% in a simple linear regression model. Our results suggest that modulating time-driven input data can generate diverse magnetization dynamics in the spin Hall oscillator that can be suitable for temporal or sequential information processing.
Date Issued
2023
Publisher
Springer
Journal
Scientific Reports
Grant ID
KAKENHI No. 18H01862
KAKENHI No. 19K21112
NRF-CRP21-2018-0003
MOE2019-T2-1-058
Funding Agency
JSPS Grant-in-Aid
National Research Foundation, Singapore
Ministry of Education, Singapore