Magnetism and morphology of Co nanocluster superlattices onGdAu2/Au(111)–(13×13)

Abstract

We present a comprehensive study of the magnetism and morphology of an ultrahigh density array of Co nanoclusters self-assembled on the single atomic layer GdAu 2 on Au(111) template surface. Combining scanning tunneling microscopy, x-ray magnetic circular dichroism, and magneto-optical Kerr effect measurements, we reveal a significant enhancement of the perpendicular magnetic anisotropy energy for noncoalesced single atomic layer nanoclusters compared to Co/Au(111). For coverages well beyond the onset of coalescence, we observe room-temperature in-plane magnetic remanence.

Sm cluster superlattice on graphene/Ir(111)

“…The half width at half maximum (HWHM) of the size distribution is 0.31 0.01 SD s =  . This value is roughly half the one 0.59 SD s = expected for a homogeneous nucleation [2], equals the widths observed for several superlattices grown on template surfaces [9,15,[50][51][52][53][54] and is very close to the best result of 0.20 SD s = [4,8]. We note that a narrower size distribution with 0.15 SD s » has been reported for magic clusters of Ga [55] or Al [18] on Si(111)-7×7.…”

“…Atoms are evaporated onto a template surface, where they diffuse and nucleate clusters on preferential sites. In this way, periodic arrays of seeds form, reproducing the symmetry and the period imposed by the template [3][4][5][6][7][8][9][10][11][12][13][14][15]. Cluster size and shape can then be controlled to a certain extent by varying the amount of deposited atoms (coverage), the substrate temperature during deposition (T dep ) and the annealing temperature after deposition (T ann ).…”

Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds

“…They all share a common, well-defined structure and excellent crystal quality with a RE-NM 2 stoichiometry, as a well as a hexagonal moiré with a nanoscale periodicity that is induced by the lattice mismatch between the RE-NM 2 monolayer and the noble metal substrate. This structural homogeneity among the series of lanthanides makes the RE-NM 2 monolayer a convenient platform to tune spin textures and magnetic properties of great interest in the field of spintronics 7 , while their chemical stability and moiré modulation convert these compounds into suitable magnetic templates to drive self-organized nanostructure growth [8][9][10][11] . At a more fundamental level, the crystal perfection and identical structure of the RE-NM 2 monolayer among the REs appear ideal to investigate the interplay between electronic properties and magnetism, that is, the connection between 4 f shell filling, f -d hybridization, RE atom valency and magnetic response in two dimensions.…”

Electronic and magnetic properties of the Fe2N monolayer film tuned by substrate symmetry

“…Recently, ferromagnetism was reported in few-atomic-layer films of van der Waals materials grown by chemical vapor transport [7][8][9]. Moreover, some ferromagnetic monolayer alloys and compounds with robust structures such as GdAg 2 [10], GdAu 2 [11] and Fe 2 N [12] have been reported.…”