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Título
Geometrical control of pure spin current induced domain wall depinning
Autor(es)
Materia
Magnetism
Domain wall motion
Pure spin current
Computational physics
Geometrical constrictions in nanostructures
Fecha de publicación
2017-03-01
Editor
IOP Publishing Ltd.
Citación
J. Phys.: Condens. Matter 29 085802 (2017)
Resumen
[EN] We investigate the pure spin-current assisted depinning of magnetic domain walls in half ring
based Py/Al lateral spin valve structures. Our optimized geometry incorporating a patterned
notch in the detector electrode, directly below the Al spin conduit, provides a tailored pinning
potential for a transverse domain wall and allows for a precise control over the magnetization
configuration and as a result the domain wall pinning. Due to the patterned notch, we are
able to study the depinning field as a function of the applied external field for certain applied
current densities and observe a clear asymmetry for the two opposite field directions.
Micromagnetic simulations show that this can be explained by the asymmetry of the pinning
potential. By direct comparison of the calculated efficiencies for different external field and
spin current directions, we are able to disentangle the different contributions from the spin
transfer torque, Joule heating and the Oersted field. The observed high efficiency of the pure
spin current induced spin transfer torque allows for a complete depinning of the domain wall
at zero external field for a charge current density of 6 1011 A m−2, which is attributed to the
optimal control of the position of the domain wall.
URI
ISSN
0953-8984
Colecciones
- SINAMAG. Artículos [40]