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Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
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Researchers used rapid cooling (thermal quenches) to control ferroic domain patterns in rare-earth orthoferrites. This nonequilibrium method creates unique domain structures, including metastable states, offering new ways to manipulate material functionality.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Thermodynamics

Background:

  • Controlling ferroic domain structures is crucial for device functionality.
  • Traditional methods use quasi-static electric or magnetic fields.
  • Metallurgy uses rapid thermal quenches to alter domain patterns, a technique underexplored in ferroics.

Purpose of the Study:

  • To investigate the use of rapid thermal quenches for controlling ferroic domain patterns.
  • To explore nonequilibrium approaches for manipulating ferroic materials.
  • To understand the dynamics of domain evolution during thermal quenching.

Main Methods:

  • Applied rapid thermal quenches across phase transitions in a rare-earth orthoferrite.
  • Varied cooling rates to trigger transitions between ferroic phases.
  • Utilized real-time imaging to observe transient domain evolution during quenching.

Main Results:

  • Achieved control over ferroic domain patterns by tuning quench rates.
  • Created intrinsic low-temperature domain structures and metastable high-temperature patterns.
  • Observed distinct timescales of domain fragmentation and relaxation during quenching.

Conclusions:

  • Thermal quenches offer a dynamic, nonequilibrium method to control ferroic domain configurations.
  • This approach enables access to metastable domain states not achievable at equilibrium.
  • The findings present a novel strategy for manipulating ferroic order and material properties.