Spin–orbit torque controlled stochastic oscillators with synchronization and frequency tunability

Author:

Debashis Punyashloka12ORCID,Maskay Aman K.2,Upadhyaya Pramey2,Chen Zhihong12ORCID

Affiliation:

1. Birck Nanotechnology Center, 1205 W State St., West Lafayette, Indiana 47907, USA

2. School of Electrical and Computer Engineering, Purdue University, 610 Purdue Mall, West Lafayette, Indiana 47907, USA

Abstract

Stochastic oscillators based on emerging nanodevices are attractive because of their ultra-low power requirement and the ability to exhibit stochastic resonance, a phenomenon where synchronization to weak input signals is enabled due to ambient noise. In this work, a low barrier nanomagnet-based stochastic oscillator is demonstrated, whose output jumps spontaneously between two states by harnessing the ambient thermal noise, requiring no additional power. By utilizing spin–orbit torque in a three-terminal device configuration, phase synchronization of these oscillators to weak periodic drives of particular frequencies is demonstrated. Experiments are performed to show the tunability of this synchronization frequency by controlling an electrical feedback parameter. The current required for synchronization is more than eight times smaller than that required for the deterministic switching of similar nanomagnetic devices. A model based on Kramers’ transition rate in a symmetric double well potential is adopted and dynamical simulations are performed to explain the experimental results.

Funder

Semiconductor Research Corporation

National Science Foundation

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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