Domain-wall depinning assisted by pure spin currents.
We study the depinning of domain walls by pure diffusive spin currents in a nonlocal spin valve structure based on two ferromagnetic Permalloy elements with copper as the nonmagnetic spin conduit. The injected spin current is absorbed by the second Permalloy structure with a domain wall, and from the dependence of the wall depinning field on the spin current density we find an efficiency of 6×10{-14}  T/(A/m{2}), which is more than an order of magnitude larger than for conventional current induced domain-wall motion. Theoretically we find that this high efficiency arises from the surface torques exerted by the absorbed spin current that lead to efficient depinning.
Ilgaz
D
D
Fachbereich Physik, Universität Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany.
Nievendick
J
J
Heyne
L
L
Backes
D
D
Rhensius
J
J
Moore
T A
TA
Niño
M A
MA
Locatelli
A
A
Menteş
T O
TO
Schmidsfeld
A V
AV
Bieren
A V
AV
Krzyk
S
S
Heyderman
L J
LJ
Kläui
M
M