[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.Comisión Europea (P7-PEOPLE-2013-ITN 608031, FP7-ICT-2009-5)
Gobierno de España (MAT2014-52477-C5-4-P)
Junta de Castilla y Leon (SA090U16)
German Ministry for Education and Science (BMBF)
German Research Foundation (DFG) via the DFG collaborative research centre SFB/TRR 173 SPIN+X
Graduate School Material Science in Mainz (DFG/GSC 266)
European Research Council - MultiRev (665672)
Research Center of Innovative and Emerging Materials at Johannes Gutenberg University (CINEMA)
German Academic Exchange Service (DAAD) via the SpinNet Program 56268455
French RENATECH networ
