56071 20200221144249.0 doi 10.1103/PhysRevB.93.174410 sideral 95050 ART-2016-95050 eng Vivas, L.G. Perpendicular magnetic anisotropy in granular multilayers of COPD alloyed nanoparticles 2016 Access copy available to the general public Unrestricted Co-Pd multilayers obtained by Pd capping of pre-deposited Co nanoparticles on amorphous alumina are systematically studied by means of high-resolution transmission electron microscopy, x-ray diffraction, extended x-ray absorption fine structure, SQUID-based magnetometry, and x-ray magnetic circular dichroism. The films are formed by COPD alloyed nanoparticles self-organized across the layers, with the interspace between the nanoparticles filled by the non-alloyed Pd metal. The nanoparticles show atomic arrangements compatible with short-range chemical order of L10 strucure type. The collective magnetic behavior is that of ferromagnetically coupled particles with perpendicular magnetic anisotropy, irrespective of the amount of deposited Pd. For increasing temperature three magnetic phases are identified: hard ferromagnetic with strong coercive field, soft-ferromagnetic as in an amorphous asperomagnet, and superparamagnetic. Increasing the amount of Pd in the system leads to both magnetic hardness increment and higher transition temperatures. Magnetic total moments of 1.77(4) µB and 0.45(4) µB are found at Co and Pd sites, respectively, where the orbital moment of Co, 0.40(2) µB, is high, while that of Pd is negligible. The effective magnetic anisotropy is the largest in the capping metal series (Pd, Pt, W, Cu, Ag, Au), which is attributed to the interparticle interaction between de nanoparticles, in addition to the intraparticle anisotropy arising from hybridization between the 3d-4d bands associated to the Co and Pd chemical arrangement in a L10 structure type. info:eu-repo/grantAgreement/ES/MINECO/MAT2014-53921-R info:eu-repo/grantAgreement/ES/DGA/IMANA-E34 info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 3.836 2016 PHYSICS, CONDENSED MATTER 18 / 67 = 0.269 2016 Q2 T1 2.339 2016 Electronic, Optical and Magnetic Materials 2016 Q1 Condensed Matter Physics 2016 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion (orcid)0000-0003-1029-3751 Rubín, J. Universidad de Zaragoza (orcid)0000-0002-8498-9383 Figueroa, A.I. (orcid)0000-0002-0047-1772 Bartolomé, F. Universidad de Zaragoza (orcid)0000-0003-1165-0087 García, L.M. Universidad de Zaragoza Deranlot, C. Petroff, F. Ruiz, L. González-Calbet, J.M. Pascarelli, S. Brookes, N.B. Wilhelm, F. Chorro, M. Rogalev, A. Bartolomé, J. 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 93, 17 (2016), 174410[18 pp] Phys. Rev. B, Condens. matter mater. phys. Physical Review B. Condensed Matter and Materials Physics 1098-0121 1911520 http://zaguan.unizar.es/record/56071/files/texto_completo.pdf Versión publicada 95245 http://zaguan.unizar.es/record/56071/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:56071 articulos driver 2020-02-21-13:26:56 ARTICLE