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Humidity-Induced Tristate Magnetic Switching in a Self-Healing High-Spin Cluster Material.

Shintaro Akagi1, Junhao Wang1, Manussada Ratanasak2

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This study introduces a novel spin material, Ni9W6, that exhibits humidity-controlled tristate magnetic switching. This discovery offers a new pathway for developing advanced stimuli-responsive magnetic materials.

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Area of Science:

  • Materials Science
  • Magnetism
  • Nanotechnology

Background:

  • Externally stimulated magnetic materials are crucial for advanced technologies like memory and sensing.
  • Achieving multistate magnetic switching, particularly tristate switching, remains a significant challenge in materials science.

Purpose of the Study:

  • To present a novel cyanide-bridged pentadecanuclear spin-cluster, Ni9W6, exhibiting reversible humidity-induced tristate magnetic switching.
  • To elucidate the mechanism behind water-mediated magnetic coupling and nanoscale domain formation.

Main Methods:

  • Synthesis and characterization of the Ni9W6 spin-cluster material.
  • Investigation of magnetic properties under varying relative humidity (RH) conditions (75%, 11%, 0%).
  • Analysis of structural changes, including nanoscale cracking and nanodomain formation upon dehydration.

Main Results:

  • Ni9W6 demonstrates distinct magnetic states: paramagnetic at 75% RH, ferromagnetic (Tc=11 K) at 11% RH, and interacting superparamagnetic (Tb=13 K) at 0% RH.
  • Water adsorption/desorption reversibly modulates superexchange pathways, tuning intercluster magnetic coupling.
  • Complete dehydration leads to reversible nanoscale cracking, forming 6-8 nm magnetic nanodomains interacting via dipolar forces.

Conclusions:

  • Water-mediated control of magnetic coupling and reversible nanodomain formation in Ni9W6 offers a design strategy for multistate stimuli-responsive materials.
  • The self-healing nature of the material and its humidity-induced switching are promising for next-generation functional devices.