Concepts in Surface Physics

Desjonquères, M.C.; Spanjaard, D.

doi:10.1007/978-3-642-97484-7

Cited by 221 publications

(211 citation statements)

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“…lc); the cube 0 located over a surface atom allows eight O-Mg bonds to be formed (Fig. ld) [24] and also in agreement with our study of hydroxyl group adsorption on oxide surfaces [25]. It [26] and in the modelization of diamond/graphite AFM images [27];…”

supporting

confidence: 86%

Theoretical analysis of tip-MgO(100) surface interactions

Castanier

Noguera

1994

Microsc. Microanal. Microstruct.

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supporting

confidence: 86%

Theoretical analysis of tip-MgO(100) surface interactions

Castanier

Noguera

1994

Microsc. Microanal. Microstruct.

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“…This can be easily understood taking into account the inelastic mean free path of below 1 nm for electrons with kinetic energies of 50-300 eV typical for LEED [26]. For the 30 keV RHEED electrons the mean free path is high enough (> 4 nm [27]) especially since the roughening allows 3D scattering. In the XPD patterns the overlayer apparently does not destroy the fine structures.…”

Section: Discussionmentioning

confidence: 99%

Comparative electron diffraction study of the diamond nucleation layer on Ir(001)

Gsell

Berner

Brugger

et al. 2008

Diamond and Related Materials

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Comparative electron diffraction study of the diamond nucleation layer on Ir (001) Gsell, S; Berner, S; Brugger, T; Schreck, M; Brescia, R; Fischer, M; Greber, T; Osterwalder, J; Stritzker, BGsell, S; Berner, S; Brugger, T; Schreck, M; Brescia, R; Fischer, M; Greber, T; Osterwalder, J; Stritzker, B (2008 Comparative electron diffraction study of the diamond nucleation layer on Ir(001) AbstractThe carbon layer formed during the bias enhanced nucleation (BEN) procedure on iridium has been studied by different electron diffraction techniques. In reflection high energy electron diffraction (RHEED) and low energy electron diffraction (LEED) the carbon nucleation layer does not give any indication of crystalline diamond even if the presence of domains proves successful nucleation. In contrast, X-ray photoelectron diffraction (XPD) shows a clear C 1s pattern when domains are present after BEN. The anisotropy in the Ir XPD patterns is reduced after BEN while the fine structure is essentially identical compared to a single crystal Ir film. The change in the Ir XPD patterns after BEN can be explained by the carbon layer on top of a crystallographically unmodified Ir film. The loss and change in the fine structure of the C 1s patterns as compared to a single crystal diamond film are discussed in terms of mosaicity and a defective structure of the ordered fraction within the carbon layer.The present results suggest that the real structure of the BEN layer is more complex than a pure composition of small but perfect diamond crystallites embedded in an amorphous matrix. The carbon layer formed during the bias enhanced nucleation (BEN) procedure on iridium has been studied by different electron diffraction techniques. In reflection high energy electron diffraction (RHEED) and low energy electron diffraction terms of mosaicity and a defective structure of the ordered fraction within the carbon layer. The present results suggest that the real structure of the BEN layer is more complex than a pure composition of small but perfect diamond crystallites embedded in an amorphous matrix.

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“…This provides accurate DW energies, as was shown long ago [33] and checked again here. Once the orientation-dependent DW energy is known, the optimal droplet shape is obtained using the Wulff construction [34]. In the case of the half droplet, in full analogy with the calculation of the contact angle of a liquid droplet on a surface, the difference of edge energies for up and down domain magnetization (that can be analytically calculated with the same model as used in the Zero temperature section) was introduced in the Wulff construction.…”

Section: Fig 4 (Color Online) Nucleation Field Vsmentioning

confidence: 99%

Chirality-Induced Asymmetric Magnetic Nucleation inPt/Co/AlOxUltrathin Microstructures

et al. 2014

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The nucleation of reversed magnetic domains in Pt/Co/AlOx microstructures with perpendicular anisotropy was studied experimentally in the presence of an in-plane magnetic field. For large enough in-plane field, nucleation was observed preferentially at an edge of the sample normal to this field. The position at which nucleation takes place was observed to depend in a chiral way on the initial magnetization and applied field directions. A quantitative explanation of these results is proposed, based on the existence of a sizable Dzyaloshinskii-Moriya interaction in this sample. Another consequence of this interaction is that the energy of domain walls can become negative for in-plane fields smaller than the effective anisotropy field. [5]. In the latter case, the transcription of the chirality from the atomic scale to the macroscopic scale of textures may be impeded by the existence of an anisotropy. This is exemplified in liquid crystals, where under a DC magnetic or electric field that induces anisotropy, the cholestericnematic transition takes place [4]. Thus, the detection and quantification of a chiral interaction when it is too weak to give rise to a global chiral texture is difficult.Magnetism is another prominent field where chiral textures are considered. A chiral magnetic interaction indeed exists, namely an anti-symmetric exchange called Dzyaloshinskii-Moriya interaction (DMI) [5, 6], that is allowed when central symmetry is broken. In many compounds having this property, especially the cubic B20 structures with depressed magnetic anisotropy, chiral textures like homochiral spin spirals or 2D skyrmion lattices have been observed, both in reciprocal [7] and in real space [8]. Another class of chiral magnetic systems has recently appeared, namely the few atomic layer thick samples grown on an underlayer with large spinorbit interaction, showing structural inversion asymmetry and perpendicular magnetic anisotropy (PMA) [9][10][11][12]. In these systems, PMA is very strong so that chiral spin spirals are not stable, and as a result DMI has remained unnoticed for about 20 years. However, at magnetic edges like a domain wall (DW) separating two uniformly magnetized domains or at physical edges in a microstructure, the competition of chiral interaction with anisotropy is modified. Indeed, the peculiarities of field and current-induced dynamics of domain walls in such samples [13][14][15] have been found to be consistent with a chiral texture localized on the DW, deriving from the presence of interface-induced DMI [16]. These local chiral magnetization textures, that appear as Néel walls of a fixed chirality, have also been observed recently by lowenergy electron microscopy [17,18], on samples with wide domain walls.In this Letter we show that chiral interactions can also be detected at the edges of a microstructure: in the presence of an additional in-plane field, nucleation of reversed domains takes place preferentially at one edge of the sample, oriented perpendicular to this field. The side at which nucle...

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Concepts in Surface Physics

Cited by 221 publications

References 0 publications

Theoretical analysis of tip-MgO(100) surface interactions

Theoretical analysis of tip-MgO(100) surface interactions

Comparative electron diffraction study of the diamond nucleation layer on Ir(001)

Chirality-Induced Asymmetric Magnetic Nucleation inPt/Co/AlOxUltrathin Microstructures

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