Step-like dependence of memory function on pulse width in spintronics reservoir computing.

Step-like dependence of memory function on pulse width in spintronics reservoir computing.
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DOI:
10.1038/s41598-020-76142-x
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发表时间:
2020-11-11
期刊:
影响因子:
4.6
通讯作者:
Taniguchi T
Taniguchi T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yamaguchi T;Akashi N;Nakajima K;Kubota H;Tsunegi S;Taniguchi T

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Physical reservoir computing is a type of recurrent neural network that applies the dynamical response from physical systems to information processing. However, the relation between computation performance and physical parameters/phenomena still remains unclear. This study reports our progress regarding the role of current-dependent magnetic damping in the computational performance of reservoir computing. The current-dependent relaxation dynamics of a magnetic vortex core results in an asymmetric memory function with respect to binary inputs. A fast relaxation caused by a large input leads to a fast fading of the input memory, whereas a slow relaxation by a small input enables the reservoir to keep the input memory for a relatively long time. As a result, a step-like dependence is found for the short-term memory and parity-check capacities on the pulse width of input data, where the capacities remain at 1.5 for a certain range of the pulse width, and drop to 1.0 for a long pulse-width limit. Both analytical and numerical analyses clarify that the step-like behavior can be attributed to the current-dependent relaxation time of the vortex core to a limit-cycle state.
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