Coherent spin-transfer precession switching in orthogonal spin-torque devices

ORAL

Abstract

We present experimental results in concert with macrospin simulations of the switching characteristics of orthogonal spin-transfer devices incorporating an out-of-plane magnetized polarizing layer and an in-plane magnetized spin valve device at cryogenic temperatures. Switching at 3.4K between parallel and anti-parallel spin-valve states is investigated for current pulses with varying durations from 0.1 to 1.4ns to observe the averaged response of the time dependent dynamics of the spin-transfer induced precession of the magnetization. We demonstrate high speed switching at short pulse lengths, down to 100ps, and also observe ensemble decoherence effects with longer pulses. The results show that even at cryogenic temperatures finite temperature noise is still important in the dynamics of precessional switching.

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Authors

  • Colm A. Ryan

    BBN Technology - Massachusetts, Raytheon BBN Technologies

  • Graham Rowlands

    BBN Technology - Massachusetts

  • Daniele Pinna

    Department of Physics, New York University, New York, NY 10003, USA

  • Li Ye

    Department of Physics, New York University, New York, NY 10003, USA

  • Laura Rehm

    Department of Physics, New York University, New York, NY 10003, USA, New York University

  • Volker Sluka

    Department of Physics, New York University, New York, NY 10003, USA

  • Andrew D. Kent

    Department of Physics, New York University, New York, NY 10003, USA, Department of Physics, New York University, New York, NY 10003, USA., New York University, New York Univ NYU, Department of Physics, New York University

  • Thomas Ohki

    BBN Technology - Massachusetts