Domain-wall pinning, nonadiabatic spin-transfer torque, and spin-current polarization in permalloy wires doped with vanadium

DOI: 10.1103/PhysRevB.81.020413

Authors: S. Lepadatu (University of Leeds) , J. S. Claydon (University of Leeds) , C. Kinane (ISIS Pulsed Neutron and Muon Source) , T. Charlton (ISIS Pulsed Neutron and Muon Source) , S. Langridge (ISIS, STFC Rutherford Appleton Laboratory) , A. Potenza (Diamond Light Source) , S. Dhesi (Diamond Light Source) , P. S. Keatley (University of Exeter) , R. Hicken (University of Exeter) , B. Hickey (University of Leeds) , C. Marrows (University of Leeds)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 81 (2) , PAGES 020413(R)

State: Published (Approved)
Published: January 2010

Abstract: Using pulsed-current measurements we investigate the domain-wall depinning via spin-transfer torque from pinning potentials in V-doped Ni80Fe20 wires. The domain-wall depinning boundary, showing the variation of threshold current density with longitudinal magnetic field is measured and reproduced using micromagnetic simulations. This method allows us to determine the spin-current polarization and nonadiabaticity parameter in these materials. By increasing the V concentration we show that the nonadiabaticity parameter is increased while the Gilbert damping is unaffected. On the other hand the spin-current polarization is decreased, resulting in larger threshold current densities.

Subject Areas: Physics


Instruments: I06-Nanoscience