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Subharmonics and aperiodicity in hysteresis loops.

J M Deutsch1, Onuttom Narayan

  • 1Department of Physics, University of California, Santa Cruz, California 95064, USA.

Physical Review Letters
|December 20, 2003
PubMed
Summary

Researchers discovered complex magnetic hysteresis cycles in spin glasses, going beyond simple loops. This novel behavior, observed in low-temperature dynamics, may be experimentally verifiable and could exhibit aperiodic magnetization in larger systems.

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Area of Science:

  • Condensed Matter Physics
  • Magnetism and Magnetic Materials

Background:

  • Hysteresis in magnetic materials typically forms simple closed loops.
  • Understanding complex dynamic behaviors in disordered magnetic systems is crucial.

Purpose of the Study:

  • To investigate novel hysteretic behaviors in magnets beyond simple closed loops.
  • To study the low-temperature dynamics of the 3D Edwards-Anderson spin glass model.

Main Methods:

  • Simulations of the 3D Edwards-Anderson spin glass model.
  • Analysis of low-temperature magnetic dynamics.

Main Results:

  • Observed hysteretic behavior that cycles multiple times before returning to the initial state.
  • The complexity of the cycles varies and increases with system size.

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  • Magnetization may become aperiodic in the large system limit for certain random configurations.

    • Conclusions:

    • Complex, multi-cycle hysteresis is possible in magnetic systems.
    • This phenomenon is linked to the dynamics of spin glasses.
    • The findings suggest potential for experimental observation and implications for understanding disordered magnetism.