8 results on '"Beysen, Sadeh"'
Search Results
2. Electrical and microstructural properties of Ta-C thin films for metal gate
- Author
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Litipu Aihaiti, Kamale Tuokedaerhan, Beysen Sadeh, Min Zhang, Shen Xiang Qian, and Abuduwaili Mijiti
- Subjects
magnetron sputtering ,nano-crystalline size ,TaC thin film ,thermal stability ,resistivity ,Materials of engineering and construction. Mechanics of materials ,TA401-492 ,Chemical technology ,TP1-1185 - Abstract
Carbon rich Nano-crystalline grain size tantalum carbide (Ta-C) thin films were prepared by non- reactive simultaneously dual magnetron sputtering. The main purpose of the current work was to investigate the influence of deposition method, deposition power, film thickness and annealing temperature on structural, surface morphology and electrical resistivity of TaC thin films. The experimental result shows that the growth rate of film was about 6.7 nm min ^−1 and films are growth like spherical structure. The atomic percentage of elements in the films were very sensitive to the deposition power, which even if the small amount of increases in the deposition power of Ta lead the increase of Ta content. However, a small change in Ta percentage did not result in a change in film structure and surface morphology. Annealing temperature did not cause structural changes in the films, but lead small changes in the grain size (range from 7.0 to 9.1 nm) and surface roughness. Resistivity variation of deposited TaC films on the annealing temperature shows random behavior which may cause by the deposition method. Nevertheless, the resistivity of the film decreases first and then increases when the thickness increases from 79.2 nm to 134 nm. Minimum resistivity of film appears at the thickness of 79.2 nm, about 235.2 μ Ω.cm. In the end, deposited TaC thin films shows good thermal stability and low enough resistivity for gate electrode application.
- Published
- 2020
- Full Text
- View/download PDF
3. Effect of Annealing Temperature on Microstructure and Resistivity of TiC Thin Films
- Author
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Beysen Sadeh, Litipu Aihaiti, Abuduwaili Mijiti, Min Zhang, Kamale Tuokedaerhan, and Xiangqian Shen
- Subjects
Titanium carbide ,Materials science ,magnetron sputtering ,Annealing (metallurgy) ,Scanning electron microscope ,TiC thin film ,Surfaces and Interfaces ,Sputter deposition ,Microstructure ,metal gate ,thermal stability ,Surfaces, Coatings and Films ,Amorphous solid ,resistivity ,chemistry.chemical_compound ,Crystallinity ,chemistry ,lcsh:TA1-2040 ,Materials Chemistry ,Thin film ,Composite material ,lcsh:Engineering (General). Civil engineering (General) - Abstract
Titanium carbide (TiC) thin films were prepared by non-reactive simultaneous double magnetron sputtering. After deposition, all samples were annealed at different temperatures under high-vacuum conditions. This paper mainly discusses the influence of deposition methods and annealing temperatures on microstructure, surface topography, bonding states and electrical resistivity of TiC films. XRD (X-ray diffraction) results show that TiC thin films can still form crystals without annealing, and the crystallinity of thin films is improved after annealing. The estimated grain size of the TiC films varies from 8.5 nm to 14.7 nm with annealing temperature. It can be seen from SEM (scanning electron microscope) images that surfaces of the films are composed of irregular particles, and when the temperature reaches to 800 °C, the shape of the particles becomes spherical. Growth rate of film is about 30.8 nm/min. Oxygen-related peaks were observed in XPS (X-ray photoelectron spectroscopy) spectra, which is due to the absorption of oxygen atoms on the surface of the film when exposed to air. Raman spectra confirm the formation of TiC crystals and amorphous states of carbon. Resistivity of TiC films decreases monotonically from 666.73 to 86.01 μΩ·cm with the increase in annealing temperature. In brief, the TiC thin films prepared in this study show good crystallinity, thermal stability and low resistivity, which can meet the requirements of metal gate applications.
- Published
- 2021
4. Electrical and microstructural properties of Ta-C thin films for metal gate
- Author
-
Beysen Sadeh, Abuduwaili Mijiti, Kamale Tuokedaerhan, Shen Xiang Qian, Litipu Aihaiti, and Min Zhang
- Subjects
Biomaterials ,Materials science ,Polymers and Plastics ,Electrical resistivity and conductivity ,Metals and Alloys ,Thermal stability ,Composite material ,Sputter deposition ,Thin film ,Metal gate ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials - Abstract
Carbon rich Nano-crystalline grain size tantalum carbide (Ta-C) thin films were prepared by non- reactive simultaneously dual magnetron sputtering. The main purpose of the current work was to investigate the influence of deposition method, deposition power, film thickness and annealing temperature on structural, surface morphology and electrical resistivity of TaC thin films. The experimental result shows that the growth rate of film was about 6.7 nm min−1 and films are growth like spherical structure. The atomic percentage of elements in the films were very sensitive to the deposition power, which even if the small amount of increases in the deposition power of Ta lead the increase of Ta content. However, a small change in Ta percentage did not result in a change in film structure and surface morphology. Annealing temperature did not cause structural changes in the films, but lead small changes in the grain size (range from 7.0 to 9.1 nm) and surface roughness. Resistivity variation of deposited TaC films on the annealing temperature shows random behavior which may cause by the deposition method. Nevertheless, the resistivity of the film decreases first and then increases when the thickness increases from 79.2 nm to 134 nm. Minimum resistivity of film appears at the thickness of 79.2 nm, about 235.2 μΩ.cm. In the end, deposited TaC thin films shows good thermal stability and low enough resistivity for gate electrode application.
- Published
- 2020
5. Magnetic Properties of Ni-Fe Ultra Thin Films with Ru Capping Layer
- Author
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Takeharu Kuroiwa, T. Furukawa, Beysen Sadeh, T. Takenaga, Hiroshi Kobayashi, and T. Oomori
- Subjects
Materials science ,Chemical engineering ,Electrical and Electronic Engineering ,Thin film ,Condensed Matter Physics ,Instrumentation ,Layer (electronics) ,Electronic, Optical and Magnetic Materials - Published
- 2005
6. High-temperature operations of rotation angle sensors with spin-valve-type magnetic tunnel junctions
- Author
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T. Oomori, Hiroshi Kobayashi, Takeharu Kuroiwa, Beysen Sadeh, and T. Takenaga
- Subjects
Materials science ,Condensed matter physics ,Magnetic moment ,Spin valve ,Rotation ,Temperature measurement ,Electronic, Optical and Magnetic Materials ,Magnetic field ,Condensed Matter::Materials Science ,Magnetization ,Tunnel magnetoresistance ,Condensed Matter::Superconductivity ,Antiferromagnetism ,Electrical and Electronic Engineering - Abstract
Direction detection of a magnetic field by spin-valve-type magnetic tunnel junction (MTJ) has been investigated at temperatures ranging from room to 150/spl deg/C, concentrating on the magnetic property of the pinned layer. Angular dependencies of resistance curves show that detection errors from cosine curve increase with rising temperatures in MTJ with the IrMn/CoFe pinned layer. Measurements of the magnetization curves of the pinned layer found that detection errors are caused by rotation of the pinned layer magnetization. Direction detection of a magnetic field by MTJ with a IrMn/CoFe/Ru/CoFe of synthetic antiferromagnetic (SyAF) pinned layer, in which magnetizations of two CoFe layers nearly cancel each other, was also investigated. We confirmed that the pinned layer of SyAF structure in MTJ effectively reduces the dependence of detection errors on temperature.
- Published
- 2005
7. Read-Cycle Endurance of Magnetic Random Access Memory Elements
- Author
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K. Sato, Beysen Sadeh, Takeharu Kuroiwa, T. Takenaga, and Hiroshi Kobayashi
- Subjects
Magnetoresistive random-access memory ,Materials science ,Magnetoresistance ,Condensed matter physics ,Magnetic storage ,Atmospheric temperature range ,Electronic, Optical and Magnetic Materials ,law.invention ,Ferromagnetism ,law ,Wafer ,Electrical and Electronic Engineering ,Quantum tunnelling ,Voltage - Abstract
The read-cycle endurance of a magnetic tunneling junction (MTJ) has been investigated, focusing on the spin-dependent tunneling current at high temperatures. The MTJ structure used in this study consisted of Ta-NiFe-CoFe-AlOx-CoFe-IrMn-NiFe-Ta prepared on a thermally oxidized Si wafer. Both the tunneling current and tunneling magnetoresistance ratio showed no significant degradation during the 1E9 read-cycle test using unipolar voltage pulses of 0.5 V at room temperature. Temperature dependence of the MTJs resistance calculated from the measured tunneling current has also been examined in a temperature range from room temperature to 175/spl deg/C. Furthermore, in the case of read-cycle tests for thermally stressed MTJs, the variation of the tunneling current was less than 2% after 1E9 cycles at a stress temperature of 175/spl deg/C. This indicates that MTJs have sufficient read-cycle endurance under high-temperature operation.
- Published
- 2004
8. Read-Cycle Endurance of Magnetic Random Access Memory Elements.
- Author
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Takeharu Kuroiwa, Takashi Takenaga, Beysen Sadeh, Hiroshi Kobayashi, and Kazunao Sato
- Subjects
RANDOM access memory ,COMPUTER storage devices ,MAGNETIC fields ,FIELD theory (Physics) ,COMPUTER input-output equipment ,SILICON - Abstract
The read-cycle endurance of a magnetic tunneling junction (MTJ) has been investigated, focusing on the spin-dependent tunneling current at high temperatures. The MTJ structure used in this study consisted of Ta-NiFe-CoFe-AlOx-CoFe-IrMn-NiFe-Ta prepared on a thermally oxidized Si wafer. Both the tunneling current and tunneling magnetoresistance ratio showed no significant degradation during the 1E9 read-cycle test using unipolar voltage pulses of 0.5 V at room temperature. Temperature dependence of the MTJs resistance calculated from the measured tunneling current has also been examined in a temperature range from room temperature to 175 °C. Furthermore in the case of read-cycle tests for thermally stressed MTJs, the variation of the tunneling current was less than 2% after 1E9 cycles at a stress temperature of 175 °C. This indicates that MTJs have sufficient read-cycle endurance under high-temperature operation. [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
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