Chaotic Behavior in CuMn13.5 Multilayer Thin Film Spin Glasses

ORAL

Abstract

The zero field cooled (ZFC) and field cooled (FC) magnetizations of an 11 nm CuMn13.5 multilayer thin film spin glass was measured using a superconducting quantum interference device (SQUID) over the time scale where the correlation length has grown to the film thickness, i.e. for time scales where the thin films crossover from 3 D to 2 D. Temperature chaos, the vulnerability of the quasi-equilibrium state to temperature perturbations, was studied by a series of temperature drops after the crossover time. We find the ZFC and FC magnetization responses are sensitive to temperature changes after crossover. Both reversible and chaotic behavior, the latter characterized as rejuvenation, are observed. The traditional interpretation using a characteristic length for chaos, and the concept that chaos is “driven by rare events,” are discussed in comparison with experimental results.

–

Presenters

  • Qiang Zhai

    The University of Texas at Austin, Physics, University of Texas

Authors

  • Qiang Zhai

    The University of Texas at Austin, Physics, University of Texas

  • Raymond Orbach

    The University of Texas at Austin, Physics, University of Texas, University of Texas at Austin

  • David Harrison

    University of Minnesota Twin Cities, Physics, University of Minnesota, University of Minnesota - Twin Cities