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Magneto-Ionic Engineering of Antiferromagnetically RKKY-Coupled Multilayers.

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Advanced Materials (Deerfield Beach, Fla.)
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Voltage-driven ion motion controls magnetism in synthetic antiferromagnets. This magneto-ionic effect enables tuning of magnetic states and interactions for energy-efficient spintronics.

Keywords:
RKKY interactionsmagneto‐ionicsperpendicular magnetic anisotropysynthetic antiferromagnetsvoltage control of magnetism

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Area of Science:

  • Solid-state physics
  • Materials science
  • Spintronics

Background:

  • Magneto-ionics, or voltage-driven ion motion, is key for energy-efficient electronics.
  • Synthetic antiferromagnets (SAFs) offer thermal stability and field robustness.
  • Controlling antiferromagnetic coupling in SAFs via magneto-ionics is underexplored.

Purpose of the Study:

  • To achieve room-temperature voltage control of magnetic coupling in Co/Ni-based SAFs.
  • To explore magneto-ionic effects in platinum-group-metal-free systems.
  • To understand the mechanisms behind voltage-induced magnetic state transitions.

Main Methods:

  • Fabrication of Co/Ni-based synthetic antiferromagnets.
  • Application of gating voltages to induce ion migration.
  • Characterization using magnetic measurements, microscopy, and spectroscopy.

Main Results:

  • Observed voltage-induced transitions between ferrimagnetic and antiferromagnetic states.
  • Demonstrated modulation of Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions.
  • Reported formation of skyrmion-like or pinned domain bubbles under low voltages.

Conclusions:

  • Voltage-triggered ion migration effectively tunes magnetic multilayers post-synthesis.
  • This offers a versatile approach for spintronic applications.
  • Potential applications include magnetic-field sensing and energy-efficient memory devices.