79107 20251204145006.0 doi 10.4028/www.scientific.net/SSP.257.60 sideral 97106 ART-2017-97106 eng Rubín, J. Universidad de Zaragoza (orcid)0000-0003-1029-3751 Perpendicular magnetic anisotropy and intralayer interactions in a single layer of CoPt nanoparticles 2017 Access copy available to the general public Unrestricted The multilayer films Al2O3/tCo Co/tPt Pt]N, produced by sequential deposition of Co and Pt on alumina consist in layers of CoPt alloyed nanoparticles. They show perpendicular magnetic anisotropy (PMA) below a freezing temperature Tf, an asperomagnetic-like phase below that temperature, and hard ferromagnetic ordering below a transition temperature T1 < Tf. A single layer granular film (N = 1) with deposition thicknesses tCo=0.7 nm, tPt=1.5 nm and particle diameter of 3 nm is presently studied. SQUID magnetometry shows that a single layer presents the three phases as well. Para-, aspero-and ferromagnetic phases are observed upon lowering the temperature, with transition temperatures Tf ˜ 375 K and T1 ˜ 200 K, respectively. In addition, the PMA persists, proving that there is no interlayer coupling in the multilayer system. SQUID results also reveal a core-shell structure in the CoPt nanoparticles. info:eu-repo/grantAgreement/ES/DGA/IMANA-E34 info:eu-repo/grantAgreement/ES/MINECO/MAT2014-53921-R info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Figueroa, A. I. (orcid)0000-0002-8498-9383 Stankiewicz, J. Universidad de Zaragoza (orcid)0000-0002-6425-024X Bartolomé, F. Universidad de Zaragoza (orcid)0000-0002-0047-1772 García, L. M. Universidad de Zaragoza (orcid)0000-0003-1165-0087 Cezar, J. C. Petroff, F. Deranlot, C. Bartolomé, J. Universidad de Zaragoza (orcid)0000-0002-6517-1236 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 257 (2017), 60-63 Diffus. defect data solid state data, Pt. B Solid state phenom. SOLID STATE PHENOMENA 1012-0394 558032 http://zaguan.unizar.es/record/79107/files/texto_completo.pdf Postprint 130749 http://zaguan.unizar.es/record/79107/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:79107 articulos driver 2025-12-04-14:45:21 ARTICLE