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arXiv · 2004.10285

Nonlinear analog spintronics with van der Waals heterostructures

S. Omar·M. Gurram·K. Watanabe·T. Taniguchi·M. H. D. Guimarães·B. J. van Wees
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Abstract

The current generation of spintronic devices, which use electron-spin relies on linear operations for spin-injection, transport and detection processes. The existence of nonlinearity in a spintronic device is indispensable for spin-based complex signal processing operations. Here we for the first time demonstrate the presence of electron-spin dependent nonlinearity in a spintronic device, and measure up to 4th harmonic spin-signals via nonlocal spin-valve and Hanle spin-precession measurements. We demonstrate its application for analog signal processing over pure spin-signals such as amplitude modulation and heterodyne detection operations which require nonlinearity as an essential element. Furthermore, we show that the presence of nonlinearity in the spin-signal has an amplifying effect on the energy-dependent conductivity induced nonlinear spin-to-charge conversion effect. The interaction of the two spin-dependent nonlinear effects in the spin transport channel leads to a highly efficient detection of the spin-signal without using ferromagnets. These effects are measured both at 4K and room temperature, and are suitable for their applications as nonlinear circuit elements in the fields of advanced-spintronics and spin-based neuromorphic computing.

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S. Omar, M. Gurram, K. Watanabe, T. Taniguchi, M. H. D. Guimarães, B. J. van Wees. 2020-04-21. Nonlinear analog spintronics with van der Waals heterostructures. https://doi.org/10.1103/physrevapplied.14.064053

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