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.
Proposal for a direct measurement of the nonadiabatic spin-transfer torque parameter β and the spin-polarization rate P
2014-01-01
Physical review / B 89(5), 054415 (2014). doi:10.1103/PhysRevB.89.054415
Article (Journal)
Electronic Resource
English
DDC: | 629 |
Electron-Spin Filters Would Offer Spin Polarization >1
Online Contents | 2009
Proposal of torque unit manipulator
British Library Online Contents | 1996
|Turbine Aerodynamic Performance Measurement Under Nonadiabatic Conditions
Online Contents | 2012
|Spin stability of torque-free systems. I, II.
AIAA | 1973
|