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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