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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Artificial spin ice (ASI) systems offer a tunable platform for studying complex magnetic phenomena.
  • Understanding ground states and phase transitions is crucial for designing novel magnetic materials and devices.

Purpose of the Study:

  • To demonstrate ground state tunability in a hybrid artificial spin ice system.
  • To identify distinct magnetic phases achievable through controlled exchange-bias fields.
  • To investigate the role of pinning in relaxation dynamics.

Main Methods:

  • Fabrication of a hybrid artificial spin ice with Fe nanomagnets.
  • Application of site-specific exchange-bias fields.
  • Utilizing external magnetic field protocols.
  • Performing Monte Carlo simulations.

Main Results:

  • Identified three distinct magnetic textures: a striped ferromagnetic phase, an antiferromagnetic phase, and an unconventional ground state with magnetic charges.
  • Achieved an antiferromagnetic phase using only an external field protocol.
  • Demonstrated that pinning influences relaxation timescales and critical behavior.

Conclusions:

  • Ground state tunability is achievable in hybrid ASI systems via controlled exchange-bias.
  • The observed magnetic phases and charge structures offer new avenues for magnetic frustration studies.
  • Exchange bias and pinning effects significantly impact the relaxation dynamics and phase transitions in ASI.