Surface reconstruction of Au(001): High-resolution real-space and reciprocal-space inspection

Hammer, René; Sander, Anke; Förster, Stefan; Kiel, Mario; Meinel, K.; Widdra, W.

doi:10.1103/physrevb.90.035446

Cited by 57 publications

(72 citation statements)

References 59 publications

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“…The Au(001) template was prepared by repeated cycles of Ar sputtering and subsequent annealing at 500°C for 10 min, until the wellknown surface reconstruction [21] was clearly visible using low-energy electron diffraction (LEED). Fe deposition was performed at a temperature of T ¼ 50 K. After deposition, the Fe films were briefly heated up to 300°C.…”

Section: A Experimentsmentioning

confidence: 99%

Fermi Surface Manipulation by External Magnetic Field Demonstrated for a Prototypical Ferromagnet

et al. 2016

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We consider the details of the near-surface electronic band structure of a prototypical ferromagnet, Fe(001). Using high-resolution angle-resolved photoemission spectroscopy, we demonstrate openings of the spin-orbit-induced electronic band gaps near the Fermi level. The band gaps, and thus the Fermi surface, can be manipulated by changing the remanent magnetization direction. The effect is of the order of ΔE ¼ 100 meV and Δk ¼ 0.1 Å −1 . We show that the observed dispersions are dominated by the bulk band structure. First-principles calculations and one-step photoemission calculations suggest that the effect is related to changes in the electronic ground state and not caused by the photoemission process itself. The symmetry of the effect indicates that the observed electronic bulk states are influenced by the presence of the surface, which might be understood as related to a Rashba-type effect. By pinpointing the regions in the electronic band structure where the switchable band gaps occur, we demonstrate the significance of spinorbit interaction even for elements as light as 3d ferromagnets. These results set a new paradigm for the investigations of spin-orbit effects in the spintronic materials. The same methodology could be used in the bottom-up design of the devices based on the switching of spin-orbit gaps such as electric-field control of magnetic anisotropy or tunneling anisotropic magnetoresistance.

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Section: A Experimentsmentioning

confidence: 99%

Fermi Surface Manipulation by External Magnetic Field Demonstrated for a Prototypical Ferromagnet

et al. 2016

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“…Whereas this intermixing can deteriorate the growth interface, it might help to improve the growth by surmounting structural barriers as is discussed for Pt (001) in the following. The bare Pt(001) surface exhibits the famous (5 × 20) surface reconstruction that is closely related to the Au(001) surface reconstruction [49,50]. Pt(001) forms a close-packed quasi-hexagonal Pt top layer on the fcc(001) square lattice.…”

Section: Oxide Growth By Mbe Versus Magnetron Sputteringmentioning

confidence: 99%

Ultrathin Perovskites: From Bulk Structures to New Interface Concepts

Förster

Widdra

2016

Oxide Materials at the Two-Dimensional Limit

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The growth of ultrathin films of ternary oxides on metal substrates enables a precise control of a variety of surface structures with particular properties. For the class of perovskite oxides, this is demonstrated with a specific focus on barium titanate (BaTiO 3 ) in the following. Introduction Structure and Properties of Perovskite OxidesPerovskite oxides are ternary oxides represented by the sum formula ABO 3 . They consist of two different types of cations A and B. Cation A formally carries a charge of 2+ or 3+ and is combined with cation B with a charge of 4+ or 3+, respectively. Together with three O 2− anions, they form a cubic or pseudo-cubic structure as depicted in Fig. 13.1. The corners of the cubic or pseudo-cubic unit cell are occupied with the A cations, the B cations are located at the body-centered position of the cubes, and the oxygen anions occupy the face-centered sites. In this structure, the oxygen forms an octahedral cage around the B cations. In the family of perovskites, a great diversity in the combination of different A and B site cations can be found. It leads to a wide range of different physical properties. Typical A site cations are alkaline earth or rare earth elements whereas at the B sites 3d, 4d, or 5d

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“…All STM measurements have been performed in ultrahigh vacuum conditions at 80 K or at 25 K. The Au(100) sample has been prepared by Ar + sputtering and annealing cycles followed the procedure in Ref. 58. For the STM measurements electrochemically etched tungsten tips were used.…”

Section: Experimental and Computational Detailsmentioning

confidence: 99%

From flat to tilted: gradual interfaces in organic thin film growth

et al. 2020

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We investigate domain formation and local morphology of thin films of α-sexithiophene (α-6T) on Au(100) beyond monolayer coverage by combining high resolution scanning tunneling microscopy (STM) experiments with electronic structure theory calculations and computational structure search. We report a layerwise growth of highly-ordered enantiopure domains. For the second and third layer, we show that the molecular orbitals of individual α-6T molecules can be well resolved by STM, providing access to detailed information on the molecular orientation. We find that already in the second layer the molecules abandon the flat adsorption structure of the monolayer and adopt a tilted conformation. Although the observed tilted arrangement resembles the orientation of α-6T in the bulk, the observed morphology does not yet correspond to a well-defined surface of the α-6T bulk structure. A similar behavior is found for the third layer indicating a growth mechanism where the bulk structure is gradually adopted over several layers. arXiv:2003.07771v1 [cond-mat.mtrl-sci]

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Surface reconstruction of Au(001): High-resolution real-space and reciprocal-space inspection

Cited by 57 publications

References 59 publications

Fermi Surface Manipulation by External Magnetic Field Demonstrated for a Prototypical Ferromagnet

Fermi Surface Manipulation by External Magnetic Field Demonstrated for a Prototypical Ferromagnet

Ultrathin Perovskites: From Bulk Structures to New Interface Concepts

From flat to tilted: gradual interfaces in organic thin film growth

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