Minimum field strength in precessional magnetization reversal

  • Back C
  • Allenspach R
  • Weber W
 et al. 
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Ultrafast magnetic field pulses as short as 2 picoseconds are able to reverse the magnetization in thin, in-plane, magnetized cobalt films. The field pulses are applied in the plane of the film, and their direction encompasses all angles with the magnetization. At a right angle to the magnetization, maximum torque is exerted on the spins. In this geometry, a precessional magnetization reversal can be triggered by fields as small as 184 kiloamperes per meter. Applications in future ultrafast magnetic recording schemes can be foreseen.

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  • Stuart ParkinMax-Planck-Institute of Microstructure Physics

  • C. H. Back

  • R. Allenspach

  • W. Weber

  • D. Weller

  • E. L. Garwin

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