Physics Colloquium: Manipulating Materials on the Nanoscale

Event Details

  • Speaker(s): Ken Burch
  • Date:
  • Time: 4 PM
  • Location: MacN 101

Department of Physics
University of Toronto

Abstract

The field of nano-spintronics aims to deliver novel multifunctional 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 20 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.

Host: Elisabeth Nicol