A5051199715- Magnetic properties of thin films
- Advanced Thermoelectric Materials and Devices
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magnetic and transport properties of perovskites and related materials
- ZnO doping and properties
- Heat Transfer and Optimization
- Solar Thermal and Photovoltaic Systems
- Physics of Superconductivity and Magnetism
- Heusler alloys: electronic and magnetic properties
- Nanofluid Flow and Heat Transfer
- Thermal Radiation and Cooling Technologies
- Plasma Diagnostics and Applications
- Magnetic Properties and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Memory and Neural Computing
- Heat Transfer and Boiling Studies
- Solar-Powered Water Purification Methods
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Geochemistry and Geologic Mapping
- Magnetic Properties of Alloys
- Thermal Expansion and Ionic Conductivity
- Metal-Organic Frameworks: Synthesis and Applications
- Chemical Synthesis and Characterization
- Characterization and Applications of Magnetic Nanoparticles
Necmettin Erbakan University
2018-2025
Istanbul Medeniyet University
2014-2023
Kilis 7 Aralık University
2022
Istanbul Aydın University
2021
Konya Technical University
2020
Karabük University
2006-2017
Dokuz Eylül University
2017
Trinity College Dublin
2010-2015
Acıbadem Kadıköy Hospital
2015
Harvard University
2008
Ferrimagnetic Mn3Ga exhibits a unique combination of low saturation magnetization (Ms = 0.11 MA m-1) and high perpendicular anisotropy with uniaxial constant Ku 0.89 MJ m-3. Epitaxial c-axis films exhibit spin polarization as 58%, measured using point contact Andreev reflection. These epitaxial will be able to support thermally stable sub-10 nm bits for transfer torque memories.
Abstract Tetragonal Mn 3− x Ga (0 ≤ 1) epitaxial films possess exceptional magnetic and electronic properties. Stoichiometric 3 crystallizes in the D0 22 structure (abstract figure) is a collinear ferrimagnet with an easy c ‐axis. It exhibits unique combination of low magnetization, high uniaxial anisotropy, Curie temperature spin polarization, which suit requirements for torque memories down to 10 nm size. 2 Ga, on other hand, much higher perpendicular anisotropy but lower make it potential...
Cubic Mn2Ga films with the half-Heusler C1b structure are grown on V (001) epitaxial films. The phase is a soft ferrimagnet, Curie temperature TC = 225 K and magnetization Ms=280 kA m(-1), equivalent to 1.65μB per formula. Adding ruthenium leads an increase of up 550 in cubic Mn2Ru(x)Ga x 0.33 collapse net magnetization. anomalous Hall effect changes sign at 0.5, where magnetic easy direction flips from plane perpendicular film. Mn2Ru0.5Ga compound valence electron count 21 identified as...
Oriented thin films of Mn3Ge with the tetragonal D022 structure, grown on strontium titanate substrates, exhibit a low magnetization Ms = 73 kA m−1 combined high uniaxial anisotropy Ku 0.91 MJ m−3 at 300 K, making them potentially useful for thermally stable sub-10 nm spin torque memory elements. The highly ordered epitaxial (001) show 46% diffusive polarization Fermi level, measured by point contact Andreev reflection. Density functional calculations that compounds are ferrimagnetic,...
Mn${}_{3}$Ga bulk material and thin films deposited on several different substrates have been investigated using x-ray neutron diffraction, absorption spectroscopy, magnetic circular dichroism, electronic structure calculations density-functional theory with the aim of determining atomic site occupancy, moments, this tetragonal D0${}_{22}$-structure compound. The has close to ideal Ga $2a$ sites Mn $2b$ $4d$ sites. is basically ferrimagnetic, larger moment about 3 ${\ensuremath{\mu}}_{B}$...
We derive spin-diffusion lengths at 4.2 K in sputtered Pd and Pt of lsfPd=25−5+10 nm lsfPt=14±6 nm, interface specific resistances Pd/Cu Pt/Cu 2ARPd/Cu=0.9±0.1 fΩ m2 2ARPt/Cu=1.5±0.1 m2, the amount spin-memory loss interfaces as δPd/Cu=0.24−0.03+0.06 δPt/Cu=0.9±0.1. compare our values with those from metals similar rows Periodic Table, Nb for W Pd.
Three different industrial carbon blacks were characterized in their surface chemistry with respect to relative abilities activate molecular oxygen. A variety of techniques was used including x-ray diffraction, gasification experiments, electron spectroscopy as XPS and UPS, helium ion scattering spectroscopy, thermal desorption the catalytic oxidation aqueous SO2 a "chemical probe" for activated The activation properties oxygen at high temperatures probed by analysing characteristics 5 vol %...
In this study, the performance of ideal open cycle gas turbine system was examined based on its thermodynamic analysis. The effects some parameters, such as compressor inlet temperature (CIT), pressure ratio (PR) and (TIT), parameters were discussed. net power output, thermal efficiency fuel consumption taken parameters. values these calculated using basic equations variables properties. Other lower heating value, combustion isentropic efficiencies assumed to be constant. result showed that...
By combining pairs of ferromagnetic metals with the same or different signs scattering anisotropies in ferromagnetic-nonmagnetic-ferromagnetic metal nanopillars, we independently invert just magnetoresistance, direction current-induced magnetization switching, both together, at room temperature (295 K) and 4.2 K. In all cases studied, switching is correctly predicted from net anisotropy fixed ferromagnet, including bulk interfacial contributions.
Perpendicular magnetic anisotropy (PMA) is induced in Co/Ni multilayers when they are grown on a (111) textured Au seed layer, provided it at least 2 nm thick. The increases with increasing thickness due to improved crystallinity. Postannealing treatments of as-grown [Co(0.3)/Ni(0.6)]5 (thicknesses nanometer) enhance the coercivity and PMA up an annealing temperature 250 °C, but higher temperatures lead intermixing Co Ni which diminishes PMA. easy axis becomes in-plane for samples annealed...
Abstract The article provides a comprehensive description of the synthesis and characterization Ca 2.5 Ag 0.3 Ce 0.2 Co 4 O 9 semiconducting ceramics for potential application in thermoelectric generators, particularly aerospace industry. These materials were synthesized using sol–gel method, with distilled water serving as solvent citric acid monohydrate incorporated into expedited gel formation. pH turbidity values solutions monitored through meter turbidimeter, respectively. produced...
Thermoelectric conversion is a system that can convert heat energy originating from temperature difference into electrical energy. Although it has many advantages in terms of usage, research required to acquire high‐efficiency thermoelectric materials due their low efficiency. Herein, Al‐ and In‐doped ZnO semiconductor material synthesized, produced, examined for use the production generators be used aviation applications. The synthesis ZnAlIn powders carried out by sol–gel method. xerogel...
Boron diffusion out of the CoFeB layers in model systems with thick and MgO grown by radiofrequency sputtering or electron-beam evaporation MgO-based magnetic tunnel junctions (MTJs) is probed after annealing x-ray photoemission spectroscopy (XPS) electron energy loss spectroscopy. Successive interfaces are exposed ion milling stacks, layer layer, XPS system. Despite presence a high temperature 400 °C, we found no boron at MgO/CoFe interfaces. Similar results also obtained MTJs.
Oriented c-axis films of the hexagonal triangular antiferromagnetic ε-Mn3Ga have been used in bottom-pinned synthetic antiferromagnet magnetic tunnel junctions with MgO barriers, which show up to 150% tunneling magnetoresistance at room temperature. Exchange bias fields as high 150 mT can be achieved for samples field-cooled from 100 °C. Thin a Néel temperature excess 650 K and provide an interface exchange energy CoFe 0.09 mJ m−2. They isotropic uncompensated magnetization Ms = 48 kA m−1,...
The fact that the properties of thermoelectric materials are to be estimated with Artificial Neural Networks without production and measurement will help researchers in terms time cost. For this purpose, figure merit, which is performance value materials, by an experimental study. P-and n-type bulk samples were obtained 19 different compositions doping elements into Ca2.7Ag0.3Co4O9- Zn0.98Al0.02O-based oxide materials. Seebeck coefficient, electrical resistivity thermal diffusivity values...