Adsorption and spin-related properties of multi-Co atoms assembled in the half unit cells of Si(111)-(7 × 7)

Liu, Qin; Shao, Xi; Ming, Fangfei; Wang, Kedong; Xiao, Xudong

doi:10.1088/1367-2630/aa5b7a

Cited by 3 publications

(1 citation statement)

References 42 publications

(100 reference statements)

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“…A more accurate estimation of the silicon surface band gap has been previously studied via the use of the HSE hybrid functional. Using a set of ad hoc Hubbard parameters or a hybrid functional such as HSE is also possible to correct the silicon surface gap energy, but it will affect as well the resulting electronic properties of the Co adsorbate and in particular overestimate the spin magnetic moment . We have thus considered that these methods are not suitable for this study.…”

Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

Translational Manipulation of Magnetic Cobalt Adatoms on the Si(100)-2 × 1 Surface at 9 K

et al. 2019

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The controlled motion of magnetic impurities on semiconductor (SC) surfaces is of crucial importance for atomic scale magnetic devices. Still challenging because of their strong reactivity with SCs, magnetic impurities are usually studied in bulk SCs, thus preventing their manipulation. Here, we show that a single Co adatom can be steadied on the bare Si(100)-2 × 1 surface in a pedestal configuration at low temperature, 9 K, and moved along the reconstructed silicon dimer rows via the use of a scanning tunneling microscope. The electronic characteristics of the Co adatom and its surroundings are investigated via topography and dI/dV measurements. Our findings reveal that the Si−Co bonding involves hybridization between the Si-p and the Co-p x p y orbitals. This configuration indicates that the Co-d orbitals remain weakly hybridized with the silicon atoms. These results are supported by density functional theory calculations where the role of the As dopant is discussed as well as the surface reconstruction. Therefore, we show that the motion direction of the Co adatom can be influenced by the surrounding c(4 × 2) or p(2 × 2) surface reconstruction phases, thus opening future interesting magnetic applications.

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Section: Experimental and Theoretical Methodsmentioning

confidence: 99%

Translational Manipulation of Magnetic Cobalt Adatoms on the Si(100)-2 × 1 Surface at 9 K

et al. 2019

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Atomic structure and electron distribution of Co atoms adsorbed on Si(111) surface by NC-AFM/KPFM at 78 K

Wei²,

Liu³

et al. 2022

Surface Science

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Enhancing the magnetic anisotropy energy by tuning the contact areas of Ag and Ni at the Ag/Ni interface

Chow

Jiang

Chang

et al. 2018

Phys. Chem. Chem. Phys.

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Modifying the interfacial conditions of magnetic layers by capping with overlayers can efficiently enhance the magnetic functionality of a material. However, the mechanisms responsible for this are closely related to the crystalline structure, compositional combinations, and interfacial quality, and are generally complex. In this contribution, we explored the use of Ag ultrathin overlayers on annealed . A method for preparing magnetic layers with different levels of enhanced magnetic anisotropy energy was developed. The method essentially involves simply modifying the contact area of the metallic/magnetic interface. A rougher interface results in a larger contact area between the Ag and Ni layers, resulting in an increase in magnetic anisotropy energy. Moreover, post-annealing treatments led to the segregation of Ni atoms, thus making the enhancement in the coercive force even more efficient. A model permits an understanding of the contact area and a strategy for enhancing the magnetic anisotropy energy and the coercive force was developed. Our approaches and the developed model promise to be helpful in terms of developing potential applications of ultrathin magnetic layers in the area of spintronics.

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Adsorption and spin-related properties of multi-Co atoms assembled in the half unit cells of Si(111)-(7 × 7)

Cited by 3 publications

References 42 publications

Translational Manipulation of Magnetic Cobalt Adatoms on the Si(100)-2 × 1 Surface at 9 K

Translational Manipulation of Magnetic Cobalt Adatoms on the Si(100)-2 × 1 Surface at 9 K

Atomic structure and electron distribution of Co atoms adsorbed on Si(111) surface by NC-AFM/KPFM at 78 K

Enhancing the magnetic anisotropy energy by tuning the contact areas of Ag and Ni at the Ag/Ni interface

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