Congruent Evaporation and Epitaxy in Thin Film Laser Ablation Deposition (Lad) of Rare Earth Transition Metal Elements and Compounds

1990 ◽  
Vol 191 ◽  
Author(s):  
J. P. Gavigan ◽  
D. Givord ◽  
A. Lienard ◽  
O. F. K. Mcgrath ◽  
J. P. Rebouillat ◽  
...  
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Laser Ablation ◽  
Transition Metal ◽  
High Energy ◽  
Preparation Technique ◽  
Picosecond Pulses ◽  
Preparation Conditions ◽  
Thin Film Preparation ◽  
Diffraction Patterns

ABSTRACTLaser ablation deposition (LAD) is a versatile thin film preparation technique which has been slowly developing for a number of years, and is currently receiving a lot of attention as demand increasingly exploits its advantages over other established techniques. Apart from its simplicity, one of its main advantages is the possibility of congruently evaporating any solid compound target, be it metal or insulator, due to the extremely high energy and instantaneous power densities attainable with pulsed lasers (up to 50 Jcm−2 and 1012 Wcm−2 for picosecond pulses). In this paper, we report on tests for both congruent evaporation in LAD of a number of rare earth - transition metal intermetallic compounds including Nd2 Fe1 3 B, Yzn0.7, Yni3, Y2 Fe15 and Yni5 for different preparation conditions (using a Nd:YAG laser λ = 1064, 532, 355 nm, τ = 35 ps and 20 ns) and on the epitaxial growth of Yni5 and W on monocrystalline sapphire substrates. Optical and electron microscopy were used to examine film morphology while congruent evaporation was confirmed using x-ray microprobe analysis. In-situ RHEED revealed good epitaxy of the films deposited on sapphire, with the hexagonal diffraction patterns obtained for YNis being identical to those of an YNi 5 reference single crystal.

Characterizing the Magneto-optic Properties of Amorphous Rare Earth - Transition Metal Thin Films

1998 ◽  
Vol 517 ◽  
Author(s):  
W. A. Challener
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Transition Metal ◽  
Figure Of Merit ◽  
Low Noise ◽  
Optical Recording ◽  
High Coercivity ◽  
Metal Thin Films ◽  
Mo Effect ◽  
Magneto Optic

AbstractThe amorphous rare earth - transition metal (RE-TM) thin film alloys and nanolayered materials exhibit numerous properties advantageous for optical recording, including perpendicular anisotropy, high coercivity and low magnetization at room temperature, low noise, and easily adjustable Curie and compensation points. As a result these materials have been employed in all commercial magneto-optic (MO) media. On the other hand, the MO effect of these materials is relatively small and tends to decrease with decreasing wavelength. It is important to understand the useful limits of these materials in MO media, and to determine if their MO figure of merit can be substantially increased through appropriate doping or nanolayering. In this paper we discuss experimental techniques for measuring MO properties, a theoretical approach for analyzing the data and designing optical thin film stacks, and results for a variety of RE-TM thin film materials.

Large-area thin film preparation by a hybrid scanning laser ablation

1999 ◽  
Author(s):  
You-qing Wang ◽  
Xintang Huang ◽  
Chengwu An ◽  
Qingming Chen ◽  
Qiyang Xu ◽  
...  
Keyword(s):  
Thin Film ◽  
Laser Ablation ◽  
Scanning Laser ◽  
Large Area ◽  
Thin Film Preparation ◽  
Film Preparation

YBaCuO Thin Film Preparation by Laser Ablation and Sputtering

1990 ◽  
pp. 369-378
Author(s):  
B. Stritzker ◽  
J. Fröhlingsdorf ◽  
W. Zander ◽  
U. Poppe ◽  
J. Schubert ◽  
...  
Keyword(s):  
Thin Film ◽  
Laser Ablation ◽  
Thin Film Preparation ◽  
Film Preparation

Ion Beam Deposition for Novel Thin Film Materials and Coatings

2011 ◽  
Vol 674 ◽  
pp. 195-200 ◽  
Author(s):  
A.Y. Goikhman ◽  
S.A. Sheludyakov ◽  
E. A. Bogdanov
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Ion Beam ◽  
High Vacuum ◽  
Growth Conditions ◽  
High Energy ◽  
Present Contribution ◽  
Ion Beam Deposition ◽  
Thin Film Preparation ◽  
Beam Deposition

The Ion Beam Deposition (IBD) technique is not very widespread, but simple and very powerful methodic of thin film preparation, allowing to obtain high quality, smooth and very uniform films on big substrate areas (until 40 cm diameter), by target ablation with high energy particles in high vacuum. For the bombarding of the target is convenient to use the charged particles – ions of Ar, because they are easy to disperse in the electric field. Also, including neutralizing system, allow to obtain high-energy neutrals, irradiating the target, producing thin films from any kind of solid targets: from simple metals to complex conducting and non-conducting stoichiometric alloys. Thus, energy of condensing target particles is an average from several units to tens of eV. In the present contribution, we discuss the possibilities and advantages of IBD technology on application examples, including results of functional properties research of Ti, TiO2, SiO2 and Ag thin films for medicine applications, Ni, NiOx, Co and CoO single layers and structures for spintronics applications, and TiO2-SiO2, Ti-Zr-O-SiO2 multilayer structures for laser mirrors applications, produced by IBD system. Good structural, morphological quality (with roughness ~ 0.3 nm) and high uniformity on big areas along with right phase and stoichiometric state is demonstrated by convenient standard techniques for the structures prepared under the optimized growth conditions.

scholarly journals Energy converting layers for thin-film flexible photovoltaic structures

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 820-825 ◽  
Author(s):  
Katarzyna Znajdek ◽  
Natalia Szczecińska ◽  
Maciej Sibiński ◽  
Przemysław Czarnecki ◽  
Gabriela Wiosna-Sałyga ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Luminescent Properties ◽  
High Energy ◽  
Visible Range ◽  
Active Particles ◽  
Light Capture ◽  
Energy Converting

Abstract The paper presents research focused on the efficiency improvement of inorganic flexible thin-film solar cells, using energy converting layers. The light capture enhancement was achieved through the introduction of layers based on rare-earth elements, as top coatings on the amorphous silicon photovoltaic structures. Such luminescent layers are converting high-energy photons into low-energy ones, which are more efficient in photovoltaic conversion of the investigated solar cells. Towards this goal, powders consisting rare-earth elements were applied as active particles in polymer layer. For practical experiments, the screen-printing method, as a cheap, reliable and industrially-ready technology was used for layers deposition. For the experiments two compositions were selected: Sr4Al14O25: Eu,Dy (BGL-300M) and SrAl2O4: Eu,Dy (G-300M). These materials are characterized by excellent thermal and optical stability and interesting luminescent properties (they absorb ultraviolet and emit in the visible range). For the verification of investigated materials and methods, various compositions of powders and proportions were tested and analyzed.

scholarly journals Structure and Magnetic Properties of Intermetallic Rare-Earth-Transition-Metal Compounds: A Review

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 201
Author(s):  
Lotfi Bessais
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
Rare Earth ◽  
Transition Metal ◽  
Magnetic Measurements ◽  
High Energy ◽  
Metal Compounds ◽  
Energy Ball ◽  
Magnetic Applications ◽  
Short Annealing

This review discusses the properties of candidate compounds for semi-hard and hard magnetic applications. Their general formula is R1−sT5+2s with R = rare earth, T = transition metal and 0≤s≤0.5 and among them, the focus will be on the ThMn12- and Th2Zn17-type structures. Not only will the influence of the structure on the magnetic properties be shown, but also the influence of various R and T elements on the intrinsic magnetic properties will be discussed (R = Y, Pr, Nd, Sm, Gd, … and T = Fe, Co, Si, Al, Ga, Mo, Zr, Cr, Ti, V, …). The influence of the microstructure on the extrinsic magnetic properties of these R–T based intermetallic nanomaterials, prepared by high energy ball milling followed by short annealing, will be also be shown. In addition, the electronic structure studied by DFT will be presented and compared to the results of experimental magnetic measurements as well as the hyperfine parameter determined by Mössbauer spectrometry.

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