Optical receiver with helicity-dependent magnetization eversal

AZIM, Zubair Al, OSTLER, Thomas, XU, Chudong and ROY, Kaushik (2019). Optical receiver with helicity-dependent magnetization eversal. IEEE transactions on magnetics, 55 (1).

[img]
Preview
PDF
Ostler Optical Receiver with Helicity Dependent Magnetization Reversal.pdf - Accepted Version
All rights reserved.

Download (636kB) | Preview
Official URL: https://ieeexplore.ieee.org/document/8544040
Related URLs:

    Abstract

    In this paper, we propose helicity-dependent switching (HDS) of magnetization in Co/Pt for an energy efficient optical receiver. Designing a low-power optical receiver for optical-to-electrical signal conversion has proven to be very challenging. Current day optical receivers use a photodiode that produces a photocurrent in response to input optical signals, and power hungry transimpedance amplifiers are required to amplify the small photocurrents. These limitations can be overcome by using light helicity-induced switching of magnetization which can avoid the requirement of photodiodes and subsequent transimpedance amplification by sensing the change in magnetization with a magnetic tunnel junction (MTJ). Magnetization switching of a thin ferromagnet layer using circularly polarized laser pulses has recently been demonstrated which shows a one-to-one correspondence between light helicity and the magnetization state. We use these phenomena to directly switch the magnetization state of a thin Co/Pt ferromagnet layer at the receiver via circularly polarized laser pulses. The circular polarization is controlled in accordance with digital input data which establishes a one-to-one correspondence between the transmitted data and output magnetization state. The Co/Pt layer is used as the free layer of an MTJ, the resistance of which is modified by the laser pulses. Since the output magnetization state is controlled by the input data, the MTJ resistance is directly converted to a digital output signal. Our device-to-circuit level simulation results indicate that HDS-based optical receiver circuit consumes only 0.124 pJ/bit energy, which is much lower than existing techniques.

    Item Type: Article
    Uncontrolled Keywords: 02 Physical Sciences; 09 Engineering; Applied Physics
    Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Polymers, Composites and Spectroscopy Group
    Departments - Does NOT include content added after October 2018: Faculty of Science, Technology and Arts > Department of Engineering and Mathematics
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 18 Oct 2018 10:48
    Last Modified: 18 Mar 2021 06:46
    URI: http://shura.shu.ac.uk/id/eprint/22985

    Actions (login required)

    View Item View Item

    Downloads

    Downloads per month over past year

    View more statistics