Isolated indium atoms on copper surfaces: A perturbed γ-γ angular correlation study

Klas, T.; Fink, R.; Krausch, Georg; Platzer, R.; Voigt, J.; Wesche, R.; Schätz, G.

doi:10.1016/0039-6028(89)90658-4

Cited by 74 publications

(41 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electric field gradient at a surface is a result of the broken symmetry of the solid at the surface and therefore it depends on the surface orientation. This is confirmed by the results of Klas et al [6].…”

Section: Application Of Time Dif Ferential Perturbed Angular Correlatsupporting

confidence: 86%

“…However, some deviations from the linear dependence of the electric field gradient at a surface have been observed for 111In on Cu (100) [6].…”

Section: Application Of Time Dif Ferential Perturbed Angular Correlatmentioning

confidence: 99%

“…TDPAC method allows the observation of nuclear probes behaviour after their deposition on the real surface, for example [6].…”

Section: Application Of Time Dif Ferential Perturbed Angular Correlatmentioning

confidence: 99%

See 2 more Smart Citations

Application of Hyperfine Interactions to Surface Investigations

1993

View full text Add to dashboard Cite

show abstract

Section: Application Of Time Dif Ferential Perturbed Angular Correlatsupporting

confidence: 86%

“…However, some deviations from the linear dependence of the electric field gradient at a surface have been observed for 111In on Cu (100) [6].…”

Section: Application Of Time Dif Ferential Perturbed Angular Correlatmentioning

confidence: 99%

See 1 more Smart Citation

Application of Hyperfine Interactions to Surface Investigations

1993

View full text Add to dashboard Cite

show abstract

“…We emphasize that the sample preparation is done with 111m Cd or 111 In, whereas the hyperfine interaction measurement applying PAC (explicitly described in Ref. [8] with respect to surface experiments) is performed with the decay product 111 Cd. On a ferromagnetic surface, the probe nuclei with the nuclear magnetic moment m g N m N (g N is the nuclear g factor; m N is the nuclear magneton) interact with the magnetic hyperfine field B hf , and with the nuclear electric quadrupole moment Q N , they interact with the electric field gradient (EFG).…”

mentioning

confidence: 99%

“…A distinction of the different fractions is obtained by the observation of their increase and decrease with increasing temperature. By this we follow a well established procedure for the same PAC probe with measured EFGs on similar surfaces, e.g., Ni(111) [2,12]; Cu(111), Cu(001) [8]; Pd(111) [14], Pd(001) [15]. At room temperature, the probes are incorporated into steps or even into the terraces.…”

mentioning

confidence: 99%

Coordination-Number Dependence of Magnetic Hyperfine Fields atC111don Ni Surfaces

et al. 2002

View full text Add to dashboard Cite

Ferromagnetic Ni surfaces were investigated on an atomic scale using the perturbed angular correlation spectroscopy probe 111 Cd. A comprehensive set of data for magnetic hyperfine fields (B hf ) at various probe sites is presented. A field variation from 27 T in Ni bulk to the surprisingly large value of 16 T at the adatom position on Ni (111) The knowledge of magnetic properties on an atomic scale on magnetic surfaces and at interfaces of ultrathin magnetic multilayers is becoming increasingly important in both basic research and in the field of applications such as the miniaturization of magnetic devices to smaller and smaller units [1]. In basic research the information on the variation of magnetic properties from atomic layer to atomic layer or even from atom to atom is of fundamental interest. One way to measure magnetic properties on the atomic scale is offered by the use of radioactive probe atoms and the observation of their interaction with the immediate environment. Applying hyperfine-interaction techniques, monolayer-resolved studies are possible [2,3] because of the short range of the hyperfine interaction, where essentially only the nearest neighbors (quantitatively expressed in the coordination number NN) contribute to the interaction. Nuclear methods, in particular, the perturbed angular correlation spectroscopy (PAC), have an extremely high sensitivity. In this technique, only a highly diluted amount of probe atoms (10 24 10 25 of a monolayer) is needed. Therefore, the overall magnetic properties are not disturbed. Among the variety of magnetic interfaces, the surface of a ferromagnetic single crystal in ultrahigh vacuum (UHV) represents one of the most interesting cases. Such a surface offers a variety of different structures, e.g., terraces, steps, kinks, etc. defining the structural surface-layer roughness. Positioning the probe atoms at all sites available allows the coordination number to vary over a broad range. Magnetic properties are expected to vary considerably from structure to structure and a deep insight into the magnetic roughness of a ferromagnetic surface is obtained. In this Letter we show how magnetic properties of probe atoms on low-Miller-index surfaces of Ni(001) and Ni(111) could be measured systematically at a variety of different atomic positions. Including some single results from the literature, we present a full set of data for the coordination-number dependence of a selected magnetic property.Magnetic hyperfine fields (B hf 's) at the nuclei of probe atoms in or on ferromagnetic materials are caused by electronic spin and orbital contributions. Using the nontransition impurity Cd, a member of the 5sp elements, the polarization of the s electrons arising from the hybridization with the valence d electrons of the ferromagnetic host plays the dominant role in generating B hf 's. For transitionelement probe atoms [4,5], additional contributions would have to be taken into account which add to the complexity of the calculations, especially when magnetic properties of the ...

show abstract

Perturbed γ–γ Angular Correlation

Röder

Becker

2012

Methods in Physical Chemistry

View full text Add to dashboard Cite

Isolated indium atoms on copper surfaces: A perturbed γ-γ angular correlation study

Cited by 74 publications

References 19 publications

Application of Hyperfine Interactions to Surface Investigations

Application of Hyperfine Interactions to Surface Investigations

Coordination-Number Dependence of Magnetic Hyperfine Fields atC111don Ni Surfaces

Perturbed γ–γ Angular Correlation

Contact Info

Product

Resources

About