TY  - JOUR
AU  - Yan, Ming
AU  - Kákay, Attila
AU  - Hertel, Riccardo
TI  - Proposal for a direct measurement of the nonadiabatic spin-transfer torque parameter β and the spin-polarization rate P
JO  - Physical review / B
VL  - 89
IS  - 5
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2015-04174
SP  - 054415
PY  - 2014
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000332388700004
DO  - DOI:10.1103/PhysRevB.89.054415
UR  - https://juser.fz-juelich.de/record/201880
ER  -