Magnetism of Rh and Ru atoms, clusters, and monolayers on Au and Ag surfaces

Beckmann, H.; Bergmann, Gerd

doi:10.1103/physrevb.55.14350

Cited by 32 publications

(14 citation statements)

References 35 publications

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“…The magnetoresistance measurements by Beckmann and Bergmann seem to support this hypothesis, showing that the dephasing rate of electrons scattered off Ru and Rh impurities is suppressed at low temperature as a result of screening of the local 4d moments. 19 As already noted by these authors, however, Kondo screening and spin fluctuations are expected to become less important for large clusters and therefore cannot explain the missing magnetic moments in the whole coverage range of the present investigation.…”

Section: Discussionmentioning

confidence: 51%

Absence of local magnetic moments in Ru and Rh impurities and clusters on Ag(100) and Pt(997)

et al. 2007

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Gardonio, S.; Carbone, C.; Krishnakumar, S. R.; Bencok, P.; Stepanow, S.; and Gambardella, P., "Absence of local magnetic moments in Ru and Rh impurities and clusters on Ag(100) and Pt(997)" (2007 The magnetism of quench-condensed Ru and Rh impurities and metal films on Ag͑100͒ and Pt͑997͒ has been studied using x-ray magnetic circular dichroism. In the coverage range between 0.22 and 2.0 ML, no dichroic signal was detected at the M 3,2 absorption edges of Ru on Ag͑100͒ at a temperature of 5 K in the presence of an applied magnetic field. The same was found for coverages between 0.12 and 0.5 ML of Rh on Ag͑100͒ and Pt͑997͒. It is concluded that the magnetic moments of single impurities, small clusters of various shape, and monolayers of the 4d metals are below the detection limit of 0.04 B per atom. These results provide an unambiguous determination of the local magnetic moment of Ru and Rh deposited on nonmagnetic transition-metal surfaces, which are in contrast with theoretical predictions.

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Section: Discussionmentioning

confidence: 51%

Absence of local magnetic moments in Ru and Rh impurities and clusters on Ag(100) and Pt(997)

et al. 2007

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“…In this respect, the case of Ni is specially interesting, given that the calculated I s for the adatom is almost 50% smaller compared to the bulk value [98]. This drop of I s is the reason why Ni is magnetic in bulk but non-magnetic as an adatom on Ag(100) and other metallic substrates [102,103].…”

Section: Searching For the Optimal Candidates Via The Stoner Criterionmentioning

confidence: 99%

Spin-fluctuation and spin-relaxation effects of single adatoms from first principles

Ibañez-Azpiroz

Dias

Blügel

et al. 2018

J. Phys.: Condens. Matter

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Single adatoms offer an exceptional playground for studying magnetism and its associated dynamics at the atomic scale. Here we review recent results on single adatoms deposited on metallic substrates, based on time-dependent density functional theory. First we analyze quantum zero-point spin-fluctuations (ZPSF) as calculated from the fluctuation-dissipation theorem, and show how they affect the magnetic stability by modifying the magnetic anisotropy energy. We also assess the impact of ZPSF in the limit of small hybridization to the substrate characteristic of semi-insulating substrates, connecting to recent experimental investigations where magnetic stability of a single adatom was achieved for the first time. Secondly, we inspect further the dynamics of single adatoms by considering the longitudinal and transverse spin-relaxation processes, whose time-scales are analyzed and related to the underlying electronic structure of both the adatom and the substrate. Thirdly, we analyze spin-fluctuation modes of paramagnetic adatoms, i.e. adatoms where the Stoner criterion for magnetism is almost fulfilled. Interestingly, such modes can develop well-defined peaks in the meV range, their main characteristics being determined by two fundamental electronic properties, namely the Stoner parameter and the density of states at the Fermi level. Furthermore, simulated inelastic scanning tunneling spectroscopy curves reveal that these spin-fluctuation modes can be triggered by tunneling electrons, opening up potential applications also for paramagnetic adatoms. Lastly, an overview of the outstanding issues and future directions is given.

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“…The magnetic moment has been predicted to increase from Pd to Rh to Ru. Experimentally, magnetism has been reported for free Rh clusters [9] and Rh clusters deposited on Au [10]. Magnetism of 4d metal layers on nonmagnetic substrates has not been confirmed [1].…”

Section: Introductionmentioning

confidence: 95%

Spin polarization, structure and chemical composition of the Rh/Fe(100) interface

2005

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Magnetism of Rh and Ru atoms, clusters, and monolayers on Au and Ag surfaces

Cited by 32 publications

References 35 publications

Absence of local magnetic moments in Ru and Rh impurities and clusters on Ag(100) and Pt(997)

Absence of local magnetic moments in Ru and Rh impurities and clusters on Ag(100) and Pt(997)

Spin-fluctuation and spin-relaxation effects of single adatoms from first principles

Spin polarization, structure and chemical composition of the Rh/Fe(100) interface

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