Switching plasticity in compensated ferrimagnetic multilayers for neuromorphic computing |
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| Affiliation: | 1.State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;2.Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;3.Beijing Academy of Quantum Information Sciences, Beijing 100193, China;4.Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Current-induced multilevel magnetization switching in ferrimagnetic spintronic devices is highly pursued for the application in neuromorphic computing. In this work, we demonstrate the switching plasticity in Co/Gd ferrimagnetic multilayers where the binary states magnetization switching induced by spin-orbit toque can be tuned into a multistate one as decreasing the domain nucleation barrier. Therefore, the switching plasticity can be tuned by the perpendicular magnetic anisotropy of the multilayers and the in-plane magnetic field. Moreover, we used the switching plasticity of Co/Gd multilayers for demonstrating spike timing-dependent plasticity and sigmoid-like activation behavior. This work gives useful guidance to design multilevel spintronic devices which could be applied in high-performance neuromorphic computing. |
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| Keywords: | switching plasticity compensated ferrimagnet spin-orbit torque spike timing-dependent plasticity sigmoidal neuron handwritten digits recognition neuromorphic computing |
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