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Electrically programmable magnetic coupling in an Ising network exploiting solid-state ionic gating.

Chao Yun1,2, Zhongyu Liang1, Aleš Hrabec3,4,5

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Researchers developed a method to electrically control magnetic coupling in nanomagnets. This allows for voltage-controlled phase transitions in artificial spin ices and programmable Ising networks for advanced computing.

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Area of Science:

  • Spintronics and Nanomagnetism
  • Condensed Matter Physics
  • Materials Science

Background:

  • Two-dimensional arrays of magnetically coupled nanomagnets are crucial for studying collective phenomena and developing spintronic devices.
  • The magnetic coupling dictates cooperative behavior and functionalities in nanomagnet-based systems.

Purpose of the Study:

  • To create coupled Ising-like nanomagnets with reversible magnetic coupling.
  • To demonstrate voltage-controlled phase transitions in artificial spin ices.
  • To realize an electrically programmable Ising network for novel computing applications.

Main Methods:

  • Fabrication of coupled Ising-like nanomagnets.
  • Utilizing solid-state ionic gating for voltage-controlled magnetic anisotropy.
  • Exploiting symmetric and antisymmetric exchange interactions (Dzyaloshinskii-Moriya interaction) to control coupling alignment.
  • Application to a two-dimensional lattice to study artificial spin ices.

Main Results:

  • Reversible switching of magnetic coupling between parallel and antiparallel configurations was achieved via ionic gating.
  • A voltage-controlled phase transition was demonstrated in a two-dimensional artificial spin ice lattice.
  • Addressable control over individual couplings was realized, leading to an electrically programmable Ising network.

Conclusions:

  • The developed method enables precise electrical control over magnetic coupling in nanomagnet arrays.
  • This work paves the way for advanced nanomagnet-based logic devices and neuromorphic computing architectures.
  • The electrically programmable Ising network offers a new paradigm for designing complex magnetic systems.