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Title: Fast chirality reversal of the magnetic vortex by electric current

The possibility of high-density information encoding in magnetic materials by topologically stable inhomogeneous magnetization configurations such as domain walls, skyrmions, and vortices has motivated intense research into mechanisms enabling their control and detection. While the uniform magnetization states can be efficiently controlled by electric current using magnetic multilayer structures, this approach has proven much more difficult to implement for inhomogeneous states. Here, we report direct observation of fast reversal of magnetic vortex by electric current in a simple planar structure based on a bilayer of spin Hall material Pt with a single microscopic ferromagnetic disk contacted by asymmetric electrodes. The reversal is enabled by a combination of the chiral Oersted field and spin current generated by the nonuniform current distribution in Pt. Our results provide a route for the efficient control of inhomogeneous magnetization configurations by electric current.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Physics, Emory University, Atlanta, Georgia 30322 (United States)
  2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  3. Innovent Technology Development, Pruessingstr. 27B, Jena D-07745 (Germany)
  4. General Numerics Research Lab e.V., An der Leite 3b, Jena D-07749 (Germany)
Publication Date:
OSTI Identifier:
22402411
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHIRALITY; ELECTRIC CURRENTS; INFORMATION; LAYERS; MAGNETIC MATERIALS; MAGNETIZATION; PLATINUM; SKYRME POTENTIAL; SOLITONS; SPIN; VORTICES