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Magnetism of cobalt nanoclusters on graphene on iridium
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Image of FIG. 1.
FIG. 1.

(Color online) STM topographs of metal clusters on graphene on Ir(111): (a) Co26 seeded by Pt13, (b) Co500 seeded by Ir50, and (c) pure Co2700. Numbers are averages.

Image of FIG. 2.
FIG. 2.

(Color online) (a) TEY from Pt13Co26 clusters across the L2,3 Co absorption edges, for left and right circularly polarized x-rays in perpendicular (⊥) incidence, at 5 T and 10 K. (b) XMCD signals for ⊥ and 70° incidence (vertically shifted for clarity). Inset: XMCD signal normalized to absorption for Ir4Co8, at the beginning and after 8 h of irradiation.

Image of FIG. 3.
FIG. 3.

(Color online) Normalized M-H loops (upper horizontal axis) at 10 K for samples of Table I for in-plane (70°) and perpendicular (⊥) incidence. Temperature-dependent M-H loops (lower horizontal axis) and Langevin fits for Pt13Co26 at ⊥ incidence. Curves are vertically shifted.


Generic image for table
Table I.

Orbital (m L), spin (m S) magnetic moments and their ratio (m L/mS ) at 5 T with the x-ray beam perpendicular to the samples, which were prepared with different deposited amount of seeding and magnetic material (θ), and the average cluster distance (d) for each sample (except for Pt13Co26, where d is the moiré pitch).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetism of cobalt nanoclusters on graphene on iridium