Ultra-fast Creation and Destruction of Ferromagnetic nanowires

ORAL

Abstract

The field of nano-spintronics aims to deliver novel multi-functional devices by manipulating magnetism on unprecedented length and time scales. Here we present a technique for ultra-fast creation and destruction of ferromagnetic nanowires at room temperature. We focus on MnAs films where ferromagnetic nanowires are observed within $\pm20$ degrees of room temperature. The existence of the nanowires is monitored via Terahertz Time Domain spectroscopy (THz-TDS) through the anisotropic transmission that they induce. Upon optical excitation, the ferromagnetic nanowires are either created or destroyed, depending on the temperature and history of the sample. Thus we provide a new method for the detection and manipulation of magnetism on the nanoscale.

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Authors

  • Kenneth Burch

    • Department of Physics, University of Toronto

  • F. Chen

    • Los Alamos National Laboratory

  • A. Azad

    • Los Alamos National Laboratory

  • J. O'Hara

    • Los Alamos National Laboratory

  • S. Mack

    • Center for Spintronics and Quantum Computation, University of California, Santa Barbara

  • A.M. Dattelbaum

    • Los Alamos National Laboratory

  • G. Montano

    • Los Alamos National Laboratory

  • V.S. Zapf

    • Los Alamos National Laboratory

  • D.D. Awschalom

    • Center for Spintronics and Quantum Computation, University of California, Santa Barbara

  • R.D. Averitt

    • Department of Physics, Boston Univeristy

  • A.J. Taylor

    • Los Alamos National Laboratory