In situ study of the interaction of oxygen with the Si(111) surface by ultrahigh-vacuum reflection electron microscopy

2001 ◽  
Vol 35 (9) ◽  
pp. 1038-1044 ◽  
Author(s):  
S. S. Kosolobov ◽  
A. L. Aseev ◽  
A. V. Latyshev
Keyword(s):  
Electron Microscopy ◽  
Ultrahigh Vacuum ◽  
In Situ Study ◽  
Reflection Electron Microscopy

SREM observation of the interaction between the in-situ deposited Pd small particles and MgO cleavage surface

1986 ◽  
Vol 44 ◽  
pp. 382-383
Author(s):  
H.-J. Ou
Keyword(s):  
Electron Microscopy ◽  
Small Particle ◽  
Small Particles ◽  
Cleavage Surface ◽  
Metallic Particles ◽  
Microscopy Technique ◽  
Ceramic Surfaces ◽  
Reflection Electron Microscopy ◽  
New Perspective

The understanding of the interactions between the small metallic particles and ceramic surfaces has been studied by many catalyst scientists. We had developed Scanning Reflection Electron Microscopy technique to study surface structure of MgO hulk cleaved surface and the interaction with the small particle of metals. Resolutions of 10Å has shown the periodic array of surface atomic steps on MgO. The SREM observation of the interaction between the metallic particles and the surface may provide a new perspective on such processes.

Initial stages of silicon homoepitaxy studied by in situ reflection electron microscopy

1989 ◽  
Vol 113 (2) ◽  
pp. 421-430 ◽  
Author(s):  
A. V. Latyshev ◽  
A. L. Aseev ◽  
A. B. Krasilnikov ◽  
S. I. Stenin
Keyword(s):  
Electron Microscopy ◽  
Reflection Electron Microscopy

scholarly journals Влияние электромиграции на зарождение вакансионных островков на поверхности Si(100) при сублимации

2019 ◽  
Vol 53 (6) ◽  
pp. 805
Author(s):  
С.В. Ситников ◽  
Е.Е. Родякина ◽  
А.В. Латышев
Keyword(s):  
Electron Microscopy ◽  
Theoretical Model ◽  
Temperature Dependence ◽  
Effective Charge ◽  
Positive Sign ◽  
Nucleation Center ◽  
Island Nucleation ◽  
Reflection Electron Microscopy ◽  
Elementary Charge

AbstractBy means of in situ ultrahigh vacuum reflection electron microscopy, the nucleation of vacancy islands on wide terraces of the Si(100) surface is investigated. The temperature dependence of the displacement of a vacancy island nucleation center is determined in the process of heating a sample with a dc electric current. On the basis of a theoretical model, the effective electric charge of addimers is estimated in the direction across dimer rows of the surface. The effective charge has a positive sign and does not exceed 15 units of the elementary charge in the temperature range of 1020–1120°C.

In Situ Study of Spinel Ferrite Nanocrystal Growth Using Liquid Cell Transmission Electron Microscopy

2015 ◽  
Vol 27 (23) ◽  
pp. 8146-8152 ◽  
Author(s):  
Wen-I Liang ◽  
Xiaowei Zhang ◽  
Karen Bustillo ◽  
Chung-Hua Chiu ◽  
Wen-Wei Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Spinel Ferrite ◽  
In Situ Study ◽  
Nanocrystal Growth ◽  
Transmission Electron ◽  
Cell Transmission ◽  
Liquid Cell

scholarly journals In-situ study of oxygen exposure effect on spin-orbit torque in Pt/Co bilayers in ultrahigh vacuum

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hang Xie ◽  
Jiaren Yuan ◽  
Ziyan Luo ◽  
Yumeng Yang ◽  
Yihong Wu
Keyword(s):  
Ultrahigh Vacuum ◽  
Underlying Mechanism ◽  
Spin Torque ◽  
Spin Orbit ◽  
Electrical Measurements ◽  
Exposure Effect ◽  
In Situ Study ◽  
Oxygen Exposure ◽  
Active Debate

AbstractOxygen incorporation has been reported to increase the current-induced spin-orbit torque in ferromagnetic heterostructures, but the underlying mechanism is still under active debate. Here, we report on an in-situ study of the oxygen exposure effect on spin-orbit torque in Pt/Co bilayers via controlled oxygen exposure, Co and Mg deposition, and electrical measurements in ultrahigh vacuum. We show that the oxygen exposure on Pt/Co indeed leads to an increase of spin-orbit torque, but the enhancement is not as large as those reported previously. Similar enhancement of spin-orbit torque is also observed after the deposition of an MgO capping layer. The results of ab initio calculations on the Rashba splitting of Pt/Co and Pt/Co/O suggest that the enhancement is due to enhanced Rashba-Edelstein effect by surface-adsorbed oxygen. Our findings shed some light on the varying roles of oxygen in modifying the spin torque efficiency reported previously.

REM Studies of Adsorption-Induced Phase Transitions and Faceting in the Si(111)-Au System

1998 ◽  
Vol 05 (03n04) ◽  
pp. 653-663 ◽  
Author(s):  
Koyu Aoki ◽  
Hiroki Minoda ◽  
Yasumasa Tanishiro ◽  
Katsumichi Yagi
Keyword(s):  
Electron Microscopy ◽  
Phase Transitions ◽  
Surface Structure ◽  
Lower Side ◽  
Domain Boundaries ◽  
Adsorption Processes ◽  
Reflection Electron Microscopy ◽  
Step Down ◽  
Successive Phase

Initial stages of Au adsorption processes on Si(111)-(7 × 7) surfaces at ~780°C, a temperature range where the surface structure undergoes successive phase transitions [(7 × 7)–("1 × 1")–(5×2)–("1 × 1")], were observed in situ by reflection electron microscopy. All of the phase transitions are heterogeneous on the surface and start at surface atomic steps. During Au adsorption on Si(111)-(7 × 7), and subsequently on Si(111)-("1 × 1") surface with wide terraces, steps advance toward the step-down direction. At a Au coverage of ~0.3 ML, the 5 × 2 structure nucleates at step edges, and the nuclei expand both to the lower side terraces and to the higher side terraces. At this stage, an effect of current for heating the specimen was noted. From measurements of such movements of the steps and the domain boundaries, the density of Si atoms in the "1 × 1" phase is estimated to be 1.3–1.7 ML at a Au coverage of ~0.3 ML. Au adsorption on Si(111) surfaces with narrow terraces causes bunching of the steps. After nucleation of the 5 × 2 structure, the bunched [Formula: see text] steps become straight along the [Formula: see text] direction, and are transformed into the (335) facet planes at a Au coverage of 0.50 ML. It was found that the (335) facet planes are stabilized by adsorbed Au atoms. Destruction of the (335) facet is noted at a Au coverage of 0.73 ML.

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