We acknowledge R. Willa and V. G. Kogan for helpful and critical comments and discussions with S. Vieira. We wish to acknowledge the support of the Departamento Administrativo de Ciencia,… Click to show full abstract
We acknowledge R. Willa and V. G. Kogan for helpful and critical comments and discussions with S. Vieira. We wish to acknowledge the support of the Departamento Administrativo de Ciencia, Tecnologia e Innovacion, COLCIENCIAS (Colombia) Programa Doctorados en el Exterior Convocatoria 568-2012. We further acknowledge support by the Spanish Ministry of Economy and Competitiveness (Grants No. FIS2014-54498-R and No. MDM-2014-0377), the Comunidad de Madrid through program Nanofrontmag-CM (Grant No. S2013/MIT-2850), the EU (IG, European Research Council PNICTEYES Grant Agreements No. 679080, No. FP7-PEOPLE-2013-CIG 618321, and No. Cost MP-1201), and by Axa Research Fund. SEGAINVEX-UAM and Banco Santander are also acknowledged. Work done at the Ames Laboratory was supported by the U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering. Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358
               
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