Ferromagnetism in stacked bilayers of Pd/C60

Ghosh, Sheuly; Tongay, Sefaattin; Hebard, A. F.; Şahin, Hasan; Peeters, F. M.

doi:10.1016/j.jmmm.2013.07.024

Cited by 9 publications

(18 citation statements)

References 32 publications

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“…Similarly, the investigation of crystallographic and magnetic structures of the Ni2XGa (where X=Mn, Fe, Co) showed that the value and the alignment of the local magnetic moments sensitively depend on the interatomic distances. In addition, it was experimentally and theoretically shown that stacked bilayers of Pd/C60 are ferromagnetic and the observed ferromagnetism originates from the formation Pd clusters between the bilayers.…”

Section: Computational Methodologymentioning

confidence: 97%

Formation and diffusion characteristics of Pt clusters on Graphene, 1H‐MoS₂and 1T‐TaS₂

et al. 2014

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Many experiments have revealed that the surfaces of graphene and graphene-like structures can play an active role as a host surface for clusterization of transition metal atoms. Motivated by these observations, we investigate theoretically the adsorption, diffusion and magnetic properties of Pt clusters on three different two-dimensional atomic crystals using first principles density functional theory. We found that monolayers of graphene, molybdenum disulfide (1H-MoS 2 ) and tantalum disulfide (1T-TaS 2 ) provide different nucleation characteristics for Pt cluster formation. At low temperatures, while the bridge site is the most favorable site where the growth of a Pt cluster starts on graphene, top-Mo and top-Ta sites are preferred on 1H-MoS 2 and 1T-TaS 2 , respectively. Ground state structures and magnetic properties of Pt n clusters (n = 2,3,4) on three different monolayer crystal structures are obtained. We found that the formation of Pt 2 dimer and a triangle-shaped Pt 3 cluster perpendicular to the surface are favored over the three different surfaces. While bent rhombus shaped Pt 4 is formed on graphene, the formation of tetrahedral shaped clusters are more favorable on 1H-MoS 2 and 1T-TaS 2 . Our study of the formation of Pt n clusters on three different monolayers provides a gateway for further exploration of nanocluster formations on various surfaces.

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Section: Computational Methodologymentioning

confidence: 97%

Formation and diffusion characteristics of Pt clusters on Graphene, 1H‐MoS₂and 1T‐TaS₂

et al. 2014

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“…When going down to nanoscale, the surface to volume ratio increases and gives rise to size-dependent properties. Both experimental and theoretical studies indicate a ferromagnetic behaviour in low dimensional Pd systems, such as thin films, [1][2][3][4][5][6][7] nanowires, 8,9 a few nanometer size clusters, [10][11][12] grain and twin boundaries, 11,13 reduced or unsaturated coordination of surface atoms, 10 and the expansion of lattice spacings. 14 Stable ferromagnetism in metals sets in when the Stoner criterion ID( F ) > 1 is fulfilled, I is the exchange integral, and D( F ) is the density of states at Fermi energy F .…”

Section: Introductionmentioning

confidence: 99%

Growth mode-dependent ferromagnetic properties of palladium nanoclusters

Venäläinen

Jalkanen

Tuboltsev

et al. 2018

Journal of Applied Physics

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Cluster deposited Pd films exhibit ferromagnetism in the temperature range from 1.8 to 400 K. The magnetization properties are found to be dependent on the film thickness. The varying morphology of the resulting Pd film with respect to thickness suggests that cluster size, deposition energy, and substrate type are crucial for the resulting film magnetization. This is demonstrated by the characteristic ferromagnetic hysteresis with the temperature dependent saturation magnetization, remanence, and coercivity of palladium nanocluster aggregates. The temperature dependence of the saturation magnetization, remanence, and coercivity of Pd nanoclusters were measured using an ultra-highsensitive magnetometer based on a superconducting quantum interference device, and the morphology of the samples was analyzed by tunneling electron microscopy.

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“…Annealing leads to a mutual exchange of Li isotopes through the spacer layers and adjacent interfaces by Li permeation and thus to a leveling of the isotope fractions. The Li kinetics is obtained by measuring the fraction of 6 Li and 7 Li isotopes in the Li reservoirs. The multilayer sketched in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…2 3.1 Atomic and isotope depth profiling performed with SIMS Fig. 2 and 3 represent the 6 Li/ 7 Li isotope contrast in the LiNbO 3 layers of the multilayer with Si, Cr and C spacer layers as measured by SIMS depth profiling. Astounding periodic SIMS signals were measured in the depth profiles for the ML with Si and Cr spacer layers (ESI 2 ).…”

Section: Methodsmentioning

confidence: 99%

“…Artificial multilayers 1,2 present an opportunity to design stable structures with non-equilibrium properties different from the bulk forms of their components. [3][4][5][6][7][8][9][10][11][12] The more different the properties of alternating layers are, the more surprising can be the properties of a whole multilayer. The proximity of an electronic insulator to a pure electronic conductor can lead to spatially separated ultrafast (dual) transport pathways of electrons and ions with ionic diffusion coefficients higher than in liquids.…”

Section: Introductionmentioning

confidence: 99%

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Lithium permeation within lithium niobate multilayers with ultrathin chromium, silicon and carbon spacer layers

Hüger

Dörrer

Yimnirun

et al. 2018

Phys. Chem. Chem. Phys.

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Li permeation through ultrathin Cr, Si and C layers and interfaces is of interest in the optimization of lithium ion batteries with respect to the control of Li flux. Twenty-one LiNbO3 layers (9 nm), which serve as solid state Li reservoirs, were sputter deposited in an alternating sequence of enriched 6Li or 7Li isotope fractions spaced with (8 nm) thin Cr, Si and C layers. The Li isotope contrast was used to measure Li permeation using depth profiling by secondary ion mass spectrometry and neutron reflectometry on a nanometer scale. Extremely low Li permeation for Cr and Si at room temperature exemplifies the effective blocking of Li movement at least for five years. However, Li permeation through C layers was found to be faster than through Cr and Si layers. With temperature, the Li permeation is enhanced through Cr as compared to that through Si layers. Furthermore, material characterisation shows amorphous LiNbO3, C and Si layers and polycrystalline Cr layers (with 80% elemental bcc chromium and 20% chromium-oxide situated at Cr/LiNbO3 interfaces). Annealing in air at 100 °C (373 K) does not oxidize the Cr layers any further. A stress of 12 GPa, which was measured in Cr spacer layers at room temperature, remains unchanged upon annealing. The origin of a weak ferromagnetic order measured at room temperature (300 K) was attributed to some traces of Cr and Si inside LiNbO3.

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Ferromagnetism in stacked bilayers of Pd/C60

Cited by 9 publications

References 32 publications

Formation and diffusion characteristics of Pt clusters on Graphene, 1H‐MoS₂and 1T‐TaS₂

Formation and diffusion characteristics of Pt clusters on Graphene, 1H‐MoS₂and 1T‐TaS₂

Growth mode-dependent ferromagnetic properties of palladium nanoclusters

Lithium permeation within lithium niobate multilayers with ultrathin chromium, silicon and carbon spacer layers

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Ferromagnetism in stacked bilayers of Pd/C60

Cited by 9 publications

References 32 publications

Formation and diffusion characteristics of Pt clusters on Graphene, 1H‐MoS2and 1T‐TaS2

Formation and diffusion characteristics of Pt clusters on Graphene, 1H‐MoS2and 1T‐TaS2

Growth mode-dependent ferromagnetic properties of palladium nanoclusters

Lithium permeation within lithium niobate multilayers with ultrathin chromium, silicon and carbon spacer layers

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Product

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Formation and diffusion characteristics of Pt clusters on Graphene, 1H‐MoS₂and 1T‐TaS₂

Formation and diffusion characteristics of Pt clusters on Graphene, 1H‐MoS₂and 1T‐TaS₂