# Nanoscale spin-wave wake-up receiver

## TL;DR

This paper introduces a passive, nanoscale spin-wave device that can distinguish radio-frequency pulse trains by converting phase-coded information into spin-wave interference patterns, enabling energy-efficient wake-up functions for IoT devices.

## Contribution

The paper proposes a novel passive spin-wave device that uses micromagnetic simulations to demonstrate its ability to identify pulse train patterns based on phase interference, advancing energy-efficient IoT wake-up technology.

## Key findings

- Device successfully distinguishes pulse train patterns
- Spin-wave interference encodes phase information
- Potential for low-power IoT wake-up applications

## Abstract

We present the concept of a passive spin-wave device which is able to distinguish different radio-frequency pulse trains and validate its functionality using micromagnetic simulations. The information is coded in the phase of the individual pulses which are transformed into spin-wave packets. The device splits every incoming packet into two arms, one of which is coupled to a magnonic ring which introduces a well-defined time delay and phase shift. Since the time delay is matched to the pulse repetition rate, adjacent packets interfere in a combiner which makes it possible to distinguish simple pulse train patterns by the read-out of the time-integrated spin-wave intensity in the output. Due to its passive construction, this device may serve as an energy-efficient wake-up receiver used to activate the main receiver circuit in power critical IoT applications.

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Source: https://tomesphere.com/paper/1905.03006