Determining a ranked list or degree of match is frequent computational task, and is one that does not require high numerical precision. A variety of methods for performing such calculations are being explored, such as hardware methods based on lower precision Boolean logic and threshold logic, among others. We have been exploring nonBoolean hardware methods of performing these calculations using phase locking of spin torque oscillator arrays. In this scheme, phase locking of the oscillators in the array maps on to a distance metric based on an L2 norm. We will discuss the progress and challenges of implementing larger (>4) arrays of independently controllable spin torque oscillators into microwave systems that exhibit phase locking, and require stable, high speed, phase sensitive detection. Finally, we will discuss how these results may impact the prospects for applying such oscillator arrays to computational schemes that are more bio-inspired or neuromorphic in nature.
Matthew Pufall, "Degree of match determination using coupled spin-torque oscillators (Conference Presentation)," Proc. SPIE 10357, Spintronics X, 103572E (Presented at SPIE Nanoscience + Engineering: August 09, 2017; Published: 19 September 2017); https://doi.org/10.1117/12.2278028.5581371607001.
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