Study of Local Magnetization during Avalanches in Single Crystals of Mn12-acetate

ORAL

Abstract

The temporal and spatial evolution of the local magnetization has been measured during and following magnetic avalanches that occur in Mn$_{12}$-acetate during magnetic field sweeps at low temperatures. Single crystals of various sizes and shapes were mounted on an array of micro-Hall detectors, and signals from several Hall sensors were amplified and recorded simultaneously by a data acquisition card. The local magnetization was investigated at different temperatures above 0.3 K for length scales of the order of 10 to 50 microns. We will report the approximate position where the avalanches are triggered, and the estimated speed (or set a lower limit) for propagation of the magnetization avalanches through the crystal.

*Supported at City College by NSF DMR-0116808, at UC San Diego by NSF CHE-0095031 and DMR-0103290, at Florida by NSF DMR-0103290 and CHE-0123603, and at the Weizmann by ISF Center of Excellence grant.

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Authors

  • Yoko Suzuki

  • S. Mchugh

  • R. Gonzalez-Rubio

  • D. Graybill

  • Myriam P. Sarachik

    • City College of New York
    • City College of New York - CUNY

  • N. Avraham

  • Y. Myasoedov

  • H. Shtrikman

  • E. Zeldov

    • The Weizmann Institute of Science

  • E.M. Rumberger

  • D.N. Hendrickson

    • University of California at San Diego

  • N.E. Chakov

  • G. Christou

    • University of Florida at Gainesville