Magnetism of CoPd self-organized alloy clusters on Au(111)

Abstract

Large anisotropic Fe orbital moments in perpendicularly magnetized Co 2 FeAl Heusler alloy thin films revealed by angular-dependent x-ray magnetic circular dichroism

Structural and magnetic properties of granular CoPd multilayers

“…This indicates an enhancement of the Co orbital to spin moment ratio as a result of Co alloying with Pd. Furthermore, our result is in qualitative agreement with the values reported for Co-Pd nanoclusters growth on Au [18] and for Co/Pd film multilayers [19], m L /m S $0.2 and 0.22, respectively. Finally, compared to the case of Co-Pt NPs obtained by sequential capping in Ref.…”

Perpendicular magnetic anisotropy in granular multilayers of CoPd alloyed nanoparticles

“…Similar high values of the orbital moment have been found in Co 0.5 Pd 0.5 nanoclusters (i.e., composition similar to that encountered currently) on Au(111) [58] and at the Co/Pd interface in Pd/Co/Pd trilayer [14]. However, it must be noticed that in these two systems the number of 3d holes used to derive the magnetic moments from the XMCD data is rather high: 2.6 and 3.1, respectively.…”

“…4). However, other values of n h , as those reported for bulk CoPd alloy and Au/CoPd/Au thin films by DFT calculations (n h = 2.60) [58], or for Co 0.5 Pt 0.5 L1 0 alloy films (n h = 2.628) [59], can lead to a dispersion in the reported values of magnetic moments in alloyed CoPd, which has to be taken into account for comparisons.…”

“…[91]) have been systematically found in Co-Pd systems [5,63,64]. However, the enhancement in very thin Pd layers, like the [Co/0.8 nm Pd] multilayers [63], or in 0.4 ML Co 0.5 Pd 0.5 nanoclusters on Au(111) [58], is at least two times smaller than in Co 1−x Pd x much thicker films [5,58,64] or bulk alloys (Table IV) [65,92]. The low Pd moment in the Co 0.5 Pd 0.5 nanoclusters on Au has been attributed to the stretching of the alloy to epitaxial conditions on Au (111) that reduces the Pd moment.…”

Intrinsic magnetic properties of bimetallic nanoparticles elaborated by cluster beam deposition

“…Because MAE strongly depends on the local atomic distortions, we performed on French CRG BM02 and BM30B beam lines at the ESRF, X-ray diffraction and absorption at each metallic edge in view to reach quantitative lattice parameters in the 3d and 5d neighboring. As the average spin moment is very sensitive to the cluster size 38 , the enhanced proportion of low coordinated atoms at the surface (which corresponds to around 40 % in the 3nm sizerange) causes a narrowing of the valence d band inversely proportional to the density of state at the Fermi level. Indeed, we have found element-specific dependences of the relaxed interreticular parameters in such bimetallic clusters.…”