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Integrated Hybrid Plasmonic-Photonic Device for All-Optical Switching and Reading of Spintronic Memory

Hamed Pezeshki1,2,3,*, Pingzhi Li1, Reinoud Lavrijsen1,2, Martijn Heck2, Erwin Bente2, Jos van der Tol2, and Bert Koopmans1,2

  • 1Department of Applied Physics and Science Education, Eindhoven University of Technology, 5612 AZ Eindhoven, Netherlands
  • 2Eindhoven Hendrik Casimir Institute, Center for Photonic Integration, Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands
  • 3EFFECT Photonics B.V., 5616 LZ Eindhoven, Netherlands

  • *h.pezeshki@tue.nl; hamedpezeshki@effectphotonics.com
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Phys. Rev. Applied 19, 054036 – Published 10 May, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.054036

Abstract

We introduce a hybrid plasmonic-photonic device for on-chip all-optical switching and reading of ferrimagnet bits with perpendicular magnetic anisotropy in a racetrack spintronic memory, coupled onto an indium phosphide waveguide. The device comprises V-shaped gold plasmonic nanoantennas coupled with a photonic crystal cavity, which enables switching and reading of the magnetic state of nanoscale bits by enhancing the absorbed energy density and polar magneto-optical Kerr effect locally. Using a finite-difference time-domain method, we show that our device can switch and read targeted bits down to 100 nm in the presence of oppositely magnetized background regions in the racetrack with widths up to 120 nm, clearly outperforming a bare photonic waveguide. Our hybrid device provides the missing link between integrated photonics and nanoscale spintronics by tackling the challenges of nonlinear absorption in the waveguide, weak magneto-optics, and size mismatch, leading to the development of ultrafast and energy-efficient advanced on-chip applications.

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Phys. Rev. Applied 19, 054036– Published 10 May, 2023
  • Received 25 January 2023
  • Revised 10 March 2023
  • Accepted 31 March 2023
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