We thank A. Anane, J. Grollier and R. Mattana for experimental help and useful discussions. We thank the European Synchrotron Radiation Facility (ESRF), and in particular the staff of beamline ID08, where several preliminary experiments were carried out. Nanofabrication was performed at the 'Plateforme de Technologies Avancées' and at the Institut Néel/CNRS 'Nanofab' facility, both in GrenobleC. acknowledge financial support through projects HF2007- 0071, S2009/MAT-1726, and CSD 2007-00010. V.U. was financially supported by grants No. MSM0021630508, No. KAN400100701 and No. 2E13800101-MSMT, and by the project INGO No. LA287 of the Czech Ministry of Education. This work was partially supported by the ANR-07-NANO-034 'Dynawall ,
Current-driven excitation of magnetic multilayers, Journal of Magnetism and Magnetic Materials, vol.159, issue.1-2, p.1, 1996. ,
DOI : 10.1016/0304-8853(96)00062-5
Time-Resolved Imaging of Spin Transfer Switching: Beyond the Macrospin Concept, Physical Review Letters, vol.96, issue.21, p.217202, 2006. ,
DOI : 10.1103/PhysRevLett.96.217202
Micromagnetic simulation on effect of oersted field and hard axis field in spin transfer torque switching, Journal of Physics D: Applied Physics, vol.40, issue.5, p.1261, 2007. ,
DOI : 10.1088/0022-3727/40/5/S10
notched mesoscopic bars, Physical Review B, vol.76, issue.5, p.54449, 2007. ,
DOI : 10.1103/PhysRevB.76.054449
Current-induced resonant depinning of a transverse magnetic domain wall in a spin valve nanostrip, Applied Physics Letters, vol.97, issue.18, p.182506, 2010. ,
DOI : 10.1063/1.3507895
Real-Space Observation of Current-Driven Domain Wall Motion in Submicron Magnetic Wires, Physical Review Letters, vol.92, issue.7, p.77205, 2004. ,
DOI : 10.1103/PhysRevLett.92.077205
Switching a spin valve back and forth by current-induced domain wall motion, Applied Physics Letters, vol.83, issue.3, p.509, 2003. ,
DOI : 10.1063/1.1594841
High Domain Wall Velocity at Zero Magnetic Field Induced by Low Current Densities in Spin Valve Nanostripes, Applied Physics Express, vol.2, p.23003, 2009. ,
DOI : 10.1143/APEX.2.023003
URL : https://hal.archives-ouvertes.fr/hal-00332055
Dynamics of surface magnetization on a nanosecond time scale, Physical Review B, vol.61, issue.14, p.9221, 2000. ,
DOI : 10.1103/PhysRevB.61.R9221
Element-Selective Nanosecond Magnetization Dynamics in Magnetic Heterostructures, Physical Review Letters, vol.86, issue.16, p.3646, 2001. ,
DOI : 10.1103/PhysRevLett.86.3646
Version 1.0, M, OOMMF User's Guide, 1999. ,
Lateral interface anisotropy in nanomagnets, Journal of Applied Physics, vol.87, issue.9, p.7067, 2000. ,
DOI : 10.1063/1.372933
Transverse wall dynamics in a spin valve nanostrip, Journal of Applied Physics, vol.105, issue.2, p.23905, 2009. ,
DOI : 10.1063/1.3067757
Oscillatory domain wall velocity of current-induced domain wall motion, Journal of Magnetism and Magnetic Materials, vol.310, issue.2, p.2032, 2007. ,
DOI : 10.1016/j.jmmm.2006.10.943
Current-excited magnetization reversal under in-plane magnetic field in a nanoscaled ferromagnetic wire, Applied Physics Letters, vol.92, issue.1, p.12505, 2008. ,
DOI : 10.1063/1.2828865
Phase Coherent Precessional Magnetization Reversal in Microscopic Spin Valve Elements, Physical Review Letters, vol.90, issue.1, p.17201, 2003. ,
DOI : 10.1103/PhysRevLett.90.017201
URL : https://hal.archives-ouvertes.fr/hal-00114926
Magnetic domain wall propagation in nanowires under transverse magnetic fields, Journal of Applied Physics, vol.103, issue.7, p.73906, 2008. ,
DOI : 10.1063/1.2887918
Experimental study of domain wall motion in long nanostrips under the influence of a transverse field, Applied Physics Letters, vol.93, issue.16, p.162505, 2008. ,
DOI : 10.1063/1.2993329