Biased quasi ballistic spin torque magnetization reversal

Details Biased quasi ballistic spin torque magnetization reversal Biased quasi ballistic spin torque magnetization reversal

2008-04-30

arxiv.org/abs/0804.4840v1

Physics

Condensed Matter

Materials Science

13 pages 3 Figures

Scientific paper

10.1103/PhysRevLett.101.087201

We explore the fundamental time limit of ultra fast spin torque induced magnetization reversal of a magnetic memory cell. Spin torque precession during a spin torque current pulse and free precessional magnetization ringing after spin torque pulse excitation is detected by time resolved magneto transport. Adapting the duration of the spin torque excitation pulse to the spin torque precession period allows suppression of the magnetization ringing and thus coherent control of the final orientation of the magnetization. In the presence of a hard axis bias field such coherent control enables an optimum ultra fast, quasi ballistic spin torque magnetization reversal by a single precessional turn directly from the initial to the reversed equilibrium state.

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