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Towards artificial Ising spin glasses: Thermal ordering in randomized arrays of Ising-type nanomagnets

  • Author(s): Saccone, Michael
  • Scholl, Andreas
  • Velten, Sven
  • Dhuey, Scott
  • Hofhuis, Kevin
  • Wuth, Clemens
  • Huang, Yen-Lin
  • Chen, Zuhuang
  • Chopdekar, Rajesh V
  • Farhan, Alan
  • et al.
Abstract

© 2019 American Physical Society. We explore the thermodynamics in two-dimensional arrays consisting of Ising-type nanomagnets lithographically arranged onto random sites and angular orientations. Introducing these basic spin-glass ingredients, we study the characteristic features of the low-energy states achieved, following thermal-annealing protocols. From direct visualization of real-time dynamics, we record relaxation timescales together with magnetic susceptibility variations over temperature, revealing trends towards short-range order as randomness is increased, but falling short of pure spin-glass behavior. Our work provides a route towards the realization of artificial Ising spin-glass systems.

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