Abstract

This paper presents the results of spintronic wireless communication using a new modulation method, spin RF-direct on-off keying modulation using a frequency division multiplex (FDM), which modulates amplitude and frequency simultaneously with a spin torque nano-oscillator (STNO) array. For the new modulation technique, each channel can be assigned to every STNO on the STNO array, and each STNO is simultaneously modulated by on-off keying with digital data directly. These modulation technologies have the advantage of increasing the data transmission rate by the number of operating STNOs. In recent years, efforts to increase the speed of transmission are important as the amount of data it sends increase. The receiver demodulates data on every channel through a band pass filter acquiring the frequency assigned to each channel, respectively. To initially confirm the possibility of realizing spin RF-direct on-off keying modulation using an FDM, we demonstrated the proposed modulation technique with two STNOs in an array, setting one STNO at 3.5 GHz frequency and the other at 4.2 GHz, and communicated wirelessly with a two-channel receiver in the near field. A data rate of up to 4 Mbps is obtained with the new modulation technique under 10 mm distance, and the DC power consumption is 0.18 mW per STNO in transmitter, including logic circuit operation.

Highlights

  • As the use of multimedia based on AI increases in IoT environment, the need to increase transmission speed is rising

  • It should be noted that we proposed a new method, making it possible to increase the data rate by actively applying an spin torque nano-oscillator (STNO) array structure

  • It should be noted that we proposed a new method, making it possible to increas9eofth15e data rate by actively applying an STNO array structure

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Summary

Introduction

As the use of multimedia based on AI increases in IoT environment, the need to increase transmission speed is rising. Devices used in IoT environments often operate based on battery, so low-power consumption is important, and small-sized implementations are required to be applied anywhere. In this environment, communication technology based on a spin torque nano-oscillator (STNO) technology is becoming an alternative. We use on-off keying (OOK) modulation [9,10] This non-coherent communication method for wireless transmission allows data transmission via air without changing the frequency to transmit wirelessly, even in the presence of STNO non-linearity. Communication performance is analyzed describing transient characteristics with the Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation

Wireless Spintronic Communication
Design of the Spin Demodulator
Conclusions
Full Text
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