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Researchers developed novel 2D twisted magnetic tunnel junctions (MTJs) using chromium(IV) sulfide bromide (CrSBr). These atomic-limit devices enable multi-state nonvolatile magnetic information storage, advancing spintronic technologies.

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Area of Science:

  • Spintronics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Magnetic tunnel junctions (MTJs) are crucial spintronic devices.
  • Two-dimensional (2D) magnets, particularly antiferromagnetic (AFM) materials, are enabling new possibilities in MTJ development.
  • Twisted 2D materials offer unique electronic and magnetic properties.

Purpose of the Study:

  • To demonstrate 2D twisted MTJs capable of storing multiple distinct nonvolatile states.
  • To explore the potential of integrating multiple twisted interfaces for enhanced data storage capacity.
  • To investigate both ferromagnetic/antiferromagnetic and all-antiferromagnetic twisted MTJ structures.

Main Methods:

  • Fabrication of asymmetric MTJs using twisted ferromagnetic and antiferromagnetic CrSBr monolayers and bilayers.
  • Characterization of tunneling magnetoresistance (TMR) in zero magnetic field at low temperatures.
  • Engineering of multi-interface MTJs by stacking additional twisted layers.
  • Demonstration of all-antiferromagnetic MTJs using multiple twisted CrSBr bilayers.

Main Results:

  • Asymmetric twisted MTJs exhibited two distinct nonvolatile states with up to 700% TMR at 2 K.
  • MTJs with a second twisted interface displayed four nonvolatile states, switchable between any state using magnetic fields.
  • All-antiferromagnetic MTJs with three twisted bilayers showed multiple nonvolatile states.
  • Demonstrated the feasibility of multi-state information storage at the atomic limit.

Conclusions:

  • Twisted 2D magnets provide a pathway to multi-state nonvolatile magnetic information storage in MTJs.
  • Integrating multiple twisted interfaces allows for increased storage density within atomic-scale devices.
  • This approach pushes the boundaries of nonvolatile memory towards the atomic limit, offering significant potential for future data storage technologies.