Diffusion and alloy formation of Co ultrathin films on Pt(111)

1996 ◽  
Vol 80 (7) ◽  
pp. 3777-3781 ◽  
Author(s):  
J. S. Tsay ◽  
C. S. Shern
Keyword(s):  
Ultrathin Films ◽  
Alloy Formation

Ag-related alloy formation and magnetic phases for Ag/Co/Ir(111) ultrathin films

2013 ◽  
Vol 548 ◽  
pp. 475-479 ◽  
Author(s):  
Jyh-Shen Tsay ◽  
Du-Cheng Tsai ◽  
Cheng-Hsun-Tony Chang ◽  
Wei-Hsiang Chen
Keyword(s):  
Ultrathin Films ◽  
Alloy Formation ◽  
Magnetic Phases

Ultrathin films of Pd on Au(111): Evidence for surface alloy formation

1992 ◽  
Vol 46 (12) ◽  
pp. 7846-7856 ◽  
Author(s):  
B. E. Koel ◽  
A. Sellidj ◽  
M. T. Paffett
Keyword(s):  
Ultrathin Films ◽  
Surface Alloy ◽  
Alloy Formation

Alloy formation of Ni ultrathin films on Pt(1 1 1) with Ag buffer layers

2004 ◽  
Vol 237 (1-4) ◽  
pp. 306-310 ◽  
Author(s):  
H.Y. Ho ◽  
C.W. Su ◽  
Y.W. Chu ◽  
C.S. Shern
Keyword(s):  
Ultrathin Films ◽  
Buffer Layers ◽  
Alloy Formation

Exchange effect on alloy formation of Co/Ag/Pt(111) ultrathin films

1999 ◽  
Vol 439 (1-3) ◽  
pp. L779-L784 ◽  
Author(s):  
C.S. Shern ◽  
Y.F. Wu ◽  
Y.E. Wu
Keyword(s):  
Ultrathin Films ◽  
Alloy Formation ◽  
Exchange Effect

Growth, Structure and magnetism of Cobalt-Platinum Ultrathin Films and Sandwiches

1993 ◽  
Vol 313 ◽  
Author(s):  
J.P. Deville ◽  
A. Barbier ◽  
C. Boeglin ◽  
B. Carriere
Keyword(s):  
Magnetic Properties ◽  
Ultrathin Films ◽  
Auger Spectroscopy ◽  
Optical Recording ◽  
Alloy Formation ◽  
Growth Structure ◽  
Growth Modes ◽  
Ultrathin Layers ◽  
Low Energy Electron ◽  
The Relationship

ABSTRACTCobalt-platinum alloys and multilayers are now well known for their potentialities in Magneto-optical recording Media. The growth of ultrathin layers and sandwiches is thought to be useful to find the relationship between the structural and magnetic properties at an atomic level. Low Energy Electron Diffraction (LEED) and Auger spectroscopy (AES) are used here to study the crystallography and the growth modes of Pt on Co (0001) surfaces. Co/Pt/Co sandwiches are also built and investigated by the same Methods. At room temperature we show the evidence of a good epitaxy of platinum on the Co (0001) surface leading to the possibility of obtaining ordered Co/Pt/Co sandwiches. Annealings at moderate temperatures lead to an epitaxial alloy formation. Auger results show that alloying indeed induces a magnetic moment on platinum atoms. This could explain the magnetic properties already observed in CO/Pt (111) Multilayers.

scholarly journals Enhanced magneto-optical effect due to interface alloy formation in Co–Pt (111) ultrathin films upon thermal annealing

2001 ◽  
Vol 169-170 ◽  
pp. 231-235 ◽  
Author(s):  
M.-T. Lin ◽  
C.C. Kuo ◽  
J.W. Ho ◽  
Y.E. Wu ◽  
H.Y. Her ◽  
...  
Keyword(s):  
Thermal Annealing ◽  
Ultrathin Films ◽  
Alloy Formation ◽  
Optical Effect ◽  
Magneto Optical Effect

HREM observations of internetallic alloy formation in Pt-Sn thin films

1992 ◽  
Vol 50 (1) ◽  
pp. 52-53
Author(s):  
D.C. Dufner
Keyword(s):  
Thin Films ◽  
Cross Sections ◽  
Carbon Films ◽  
Solid State Reactions ◽  
Alloy Formation ◽  
Reaction Behavior ◽  
Interdiffusion Process ◽  
Compositional Changes ◽  
General Goal ◽  
Film Method

The general goal of this research is to clarify mechanisms of solid state reactions at the atomic level as a step in the rationalization of macroscopic reaction behavior in solids. A study of intermetallic alloy formation resulting from interdiffusion of metals in thin films can be made by HREM. In this work, reactions between Pt and Sn in thin films are studied to elucidate mechanisms for structural and compositional changes during the interdiffusion process.Thin films of Pt and Sn used in this study were prepared by the two-film method introduced by Shiojiri. Few hundred angstroms of Pt were vacuum-deposited onto holey carbon films mounted on TEM grids. Sn films with an average thickness of 200Å were created by evaporation at rates of 15-30 Å/sec onto air-cleaved KBr substrates. The Sn films were wet-stripped and collected on the holey Pt grids. Figure 1 shows a cross-section schematic of a Pt-Sn couple. While this two-film arrangement did not allow observations of the actual reaction interface, microtomy was used to produce cross-sections.

Structure and composition of metal particles in Pt-Sn/Al2O3 bimetallic catalysts

1990 ◽  
Vol 48 (4) ◽  
pp. 278-279
Author(s):  
A. Sachdev ◽  
J. Schwank
Keyword(s):  
Bimetallic Catalysts ◽  
Bimetallic Catalyst ◽  
Size Structure ◽  
High Surface ◽  
High Surface Area ◽  
Metal Particles ◽  
Alloy Formation ◽  
Particle Size Range ◽  
Oxide Supports ◽  
Petroleum Fractions

Platinum - tin bimetallic catalysts have been primarily utilized in the chemical industry in the catalytic reforming of petroleum fractions. In this process the naphtha feedstock is converted to hydrocarbons with higher octane numbers and high anti-knock qualities. Most of these catalysts contain small metal particles or crystallites supported on high surface area insulating oxide supports. The determination of the structure and composition of these particles is crucial to the understanding of the catalytic behavior. In a bimetallic catalyst it is important to know how the two metals are distributed within the particle size range and in what way the addition of a second metal affects the size, structure and composition of the metal particles. An added complication in the Pt-Sn system is the possibility of alloy formation between the two elements for all atomic ratios.

Epitaxial growth manner and structure of superconducting oxide films

1990 ◽  
Vol 48 (4) ◽  
pp. 2-3
Author(s):  
Yoshichika Bando ◽  
Takahito Terashima ◽  
Kenji Iijima ◽  
Kazunuki Yamamoto ◽  
Kazuto Hirata ◽  
...  
Keyword(s):  
Ultrathin Films ◽  
Film Surface ◽  
High Energy ◽  
Epitaxial Films ◽  
Layer By Layer ◽  
Initial Growth ◽  
In Situ Growth ◽  
High Quality ◽  
Activated Reactive Evaporation

The high quality thin films of high-Tc superconducting oxide are necessary for elucidating the superconducting mechanism and for device application. The recent trend in the preparation of high-Tc films has been toward “in-situ” growth of the superconducting phase at relatively low temperatures. The purpose of “in-situ” growth is to attain surface smoothness suitable for fabricating film devices but also to obtain high quality film. We present the investigation on the initial growth manner of YBCO by in-situ reflective high energy electron diffraction (RHEED) technique and on the structural and superconducting properties of the resulting ultrathin films below 100Å. The epitaxial films have been grown on (100) plane of MgO and SrTiO, heated below 650°C by activated reactive evaporation. The in-situ RHEED observation and the intensity measurement was carried out during deposition of YBCO on the substrate at 650°C. The deposition rate was 0.8Å/s. Fig. 1 shows the RHEED patterns at every stage of deposition of YBCO on MgO(100). All the patterns exhibit the sharp streaks, indicating that the film surface is atomically smooth and the growth manner is layer-by-layer.

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