We propose a method to measure the nonadiabatic spin-transfer torque parameter β and the spin-polarization rate P independently. These quantities are crucial for current-driven magnetization processes, but their value could so far hardly be measured. It is shown that the motion of transverse domain walls in cylindrical nanowires, driven by a magnetic field and by an electric current, can be used to extract those values. This domain wall type propagates with a precessional motion around the wire, where the domain wall acts as a magnetic dipole rotating at well-defined frequency. The spin-polarization rate P can be deduced from the current-induced axial motion of the domain wall, while the rotational frequency of the domain wall and its variation with an external field allows one to determine the nonadiabatic spin-transfer torque. This proposal for an experiment to directly measure these quantities is based on analytical calculations and micromagnetic simulations.


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    Title :

    Proposal for a direct measurement of the nonadiabatic spin-transfer torque parameter β and the spin-polarization rate P


    Contributors:

    Publication date :

    2014-01-01


    Remarks:

    Physical review / B 89(5), 054415 (2014). doi:10.1103/PhysRevB.89.054415


    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :

    DDC:    629