Perpendicular Magnetic Anisotropy and Intralayer Interactions in a Single Layer of CoPt Nanoparticles

Javier Rubín; Adriana I. Figueroa; Jolanta Stankiewicz; Fernando Bartolomé; Luis Miguel García; Julio C. Cezar; Frédéric Petroff; Cyrile Deranlot; Juan Bartolomé

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

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HomeSolid State PhenomenaSolid State Phenomena Vol. 257Perpendicular Magnetic Anisotropy and Intralayer...

Perpendicular Magnetic Anisotropy and Intralayer Interactions in a Single Layer of CoPt Nanoparticles

Abstract:

The multilayer films [Al₂O₃/t_Co Co/t_Pt 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 T_f, an asperomagnetic-like phase below that temperature, and hard ferromagnetic ordering below a transition temperature T₁ < T_f. A single layer granular film (N = 1) with deposition thicknesses t_Co=0.7 nm, t_Pt=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 T_f ≈ 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.

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Solid State Phenomena (Volume 257)

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60-63

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https://doi.org/10.4028/www.scientific.net/SSP.257.60

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October 2016

Authors:

Javier Rubín*, Adriana I. Figueroa, Jolanta Stankiewicz, Fernando Bartolomé, Luis Miguel García, Julio C. Cezar, Frédéric Petroff, Cyrile Deranlot, Juan Bartolomé

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Co, Magnetic Properties, Nanoparticles, Pt, Single Layers

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