Perpendicular magnetic anisotropy and intralayer interactions in a single layer of CoPt nanoparticles

Rubín, J. (Universidad de Zaragoza) ; Figueroa, A. I. ; Stankiewicz, J. (Universidad de Zaragoza) ; Bartolomé, F. (Universidad de Zaragoza) ; García, L. M. (Universidad de Zaragoza) ; Cezar, J. C. ; Petroff, F. ; Deranlot, C. ; Bartolomé, J. (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

DOI: 10.4028/www.scientific.net/SSP.257.60

Año: 2017

Publicado en: SOLID STATE PHENOMENA 257 (2017), 60-63
ISSN: 1012-0394

Financiación: info:eu-repo/grantAgreement/ES/DGA/IMANA-E34
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2014-53921-R

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)