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Minimum Field Strength in Precessional Magnetization Reversal

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Science  06 Aug 1999:
Vol. 285, Issue 5429, pp. 864-867
DOI: 10.1126/science.285.5429.864

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Abstract

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.

  • * To whom correspondence should be addressed. E-mail: back{at}solid.phys.ethz.ch

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