Spin and Orbital Magnetic Moments of Free Nanoparticles

Peredkov, S.; Neeb, M.; Eberhardt, W.; Meyer, Jennifer; Tombers, Matthias; Kampschulte, Heinrich; Niedner‐Schatteburg, Gereon

doi:10.1103/physrevlett.107.233401

Cited by 97 publications

(114 citation statements)

References 35 publications

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“…In a previous XMCD study of size-selected cobalt cluster ions by Peredkov et al 52 , decoupling of the spin and orbital angular momenta has been postulated, because the authors found different Langevin scaling for orbital and spin magnetic moments in their experimental data 52 . Decoupled spin and orbital angular momenta would be surprising as these would not only require significant interatomic orbit-orbit coupling for a total µ L to interact with the magnetic field, but this decoupling would also imply that the interaction of the spin magnetic moment with the applied magnetic field were much stronger than the 3d spin-orbit interaction in the 3d transition elements.…”

Section: E Coupling Of Spin and Orbital Angular Momentamentioning

confidence: 99%

Spin and orbital magnetic moments of size-selected iron, cobalt, and nickel clusters

et al. 2014

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Spin and orbital magnetic moments of cationic iron, cobalt, and nickel clusters have been determined from x-ray magnetic circular dichroism spectroscopy. In the size regime of n = 10 − 15 atoms, these clusters show strong ferromagnetism with maximized spin magnetic moments of 1 µB per empty 3d state because of completely filled 3d majority spin bands. The only exception is Fewhere an unusually low average spin magnetic moment of 0.73 ± 0.12 µB per unoccupied 3d state is detected; an effect, which is neither observed for Co + 13 nor Ni + 13 . This distinct behavior can be linked to the existence and accessibility of antiferromagnetic, paramagnetic, or nonmagnetic phases in the respective bulk phase diagrams of iron, cobalt, and nickel. Compared to the experimental data, available density functional theory calculations generally seem to underestimate the spin magnetic moments significantly. In all clusters investigated, the orbital magnetic moment is quenched to 5 − 25 % of the atomic value by the reduced symmetry of the crystal field. The magnetic anisotropy energy is well below 65 µeV per atom.

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Section: E Coupling Of Spin and Orbital Angular Momentamentioning

confidence: 99%

Spin and orbital magnetic moments of size-selected iron, cobalt, and nickel clusters

et al. 2014

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“…As a result, a detailed knowledge of orbital magnetism is crucial in designing new materials with desired hardness and saturation moments. Most interestingly, recent XMCD experiments [9,10] on transition-metal clusters showed huge orbital moments in comparison with their bulk counterparts. Hence these systems may possess a large magnetic anisotropy energy, which makes them potentially interesting for several technological applications.…”

Section: Introductionmentioning

confidence: 99%

“…We formulate here, using several computational methods, a theory of orbital and spin * L.Peters@science.ru.nl magnetism for these clusters. In particular, we take Co clusters as a test case, because Co atoms possess the largest orbital moments among the transition-metals in all their forms, as clusters [9,10], surfaces [4], and bulk [1].…”

Section: Introductionmentioning

confidence: 99%

Correlation effects and orbital magnetism of Co clusters

et al. 2016

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Recent experiments on isolated Co clusters have shown huge orbital magnetic moments in comparison with their bulk and surface counterparts. These clusters hence provide the unique possibility to study the evolution of the orbital magnetic moment with respect to the cluster size and how competing interactions contribute to the quenching of orbital magnetism. We investigate here different theoretical methods to calculate the spin and orbital moments of Co clusters, and assess the performances of the methods in comparison with experiments. It is shown that density-functional theory in conventional local density or generalized gradient approximations, or even with a hybrid functional, severely underestimates the orbital moment. As natural extensions/corrections, we considered the orbital polarization correction, the LDA+U approximation as well as the LDA+DMFT method. Our theory shows that of the considered methods, only the LDA+DMFT method provides orbital moments in agreement with experiment, thus emphasizing the importance of dynamic correlations effects for determining fundamental magnetic properties of magnets in the nanosize regime.

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“…Core-level photoelectron spectroscopy is a surface sensitive and element specific tool which can be applied to study highly diluted samples such as free and deposited clusters by X-ray photoelectron spectroscopy (XPS), [1][2][3][4][5][6][7][8][9] X-ray absorption spectroscopy (XAS) [10][11][12] , extended X-ray absorption fine structure analysis (EXAFS), 13 grazing-incidence small-angle X-ray scattering (GISAXS), 14 X-ray magnetic circular dichroism (XMCD) [15][16][17] and Auger electron spectroscopy (AES). 18 In particular AES and XPS provide information on the initial and final states such as chemical effects, charge transfer, core-hole screening, core-hole binding energies, and electron correlation including final-state term splitting and on-site electron-electron interaction.…”

Section: Introductionmentioning

confidence: 99%

Size-dependent Auger spectra and two-hole Coulomb interaction of small supported Cu-clusters

Peters

Peredkov

Neeb

et al. 2013

Phys. Chem. Chem. Phys.

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) and X-ray photoionization spectra (2p, 3d) of mass-selected Cu N -clusters supported by a thin natural silica layer are presented in the size range N = 8-55 atoms per cluster. The Auger spectra of all clusters are shifted to a lower kinetic energy with respect to the spectrum of the bulk.Furthermore the Auger energy decreases systematically with decreasing cluster size. The binding energies of the 2p and 3d valence states are higher than the corresponding bulk values. Using the energy of the Auger main line, the corresponding core hole peak and the centroid of the selfconvoluted 3d valence band the on-site Coulomb interaction energy U dd of the two-hole final state as a function of cluster size has been determined.

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Spin and Orbital Magnetic Moments of Free Nanoparticles

Cited by 97 publications

References 35 publications

Spin and orbital magnetic moments of size-selected iron, cobalt, and nickel clusters

Spin and orbital magnetic moments of size-selected iron, cobalt, and nickel clusters

Correlation effects and orbital magnetism of Co clusters

Size-dependent Auger spectra and two-hole Coulomb interaction of small supported Cu-clusters

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