Evidence of L1(0) chemical order in CoPt nanoclusters: Direct observation and magnetic signature - Archive ouverte HAL Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2008

Evidence of L1(0) chemical order in CoPt nanoclusters: Direct observation and magnetic signature

Abstract

We report the synthesis and characterization of well-defined CoPt clusters with a mean diameter of 3 nm, produced in ultrahigh vacuum conditions following a physical route. Samples made of diluted layers of CoPt clusters embedded in amorphous carbon have been studied by transmission electron microscopy. High-resolution observations have revealed the appearance of L1(0) chemical order upon annealing, even for clusters with a 2 nm diameter, without cluster coalescence. The magnetic properties of both chemically disordered and ordered CoPt clusters embedded in amorphous carbon have then been measured by x-ray magnetic circular dichroism and superconducting quantum interference device magnetometry. Despite a striking change of the Co magnetic moment, the magnetic anisotropy of chemically ordered nanoparticles increases, with respect to the chemically disordered A1 phase, in much lower proportions than what is observed for the bulk.

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Materials
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Dates and versions

hal-01822684 , version 1 (21-01-2022)

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Florent Tournus, Alexandre Tamion, Nils Blanc, Abdelkrim Hannour, Laurent Bardotti, et al.. Evidence of L1(0) chemical order in CoPt nanoclusters: Direct observation and magnetic signature. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2008, 77 (14), pp.144411. ⟨10.1103/PhysRevB.77.144411⟩. ⟨hal-01822684⟩
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