"S" Keywords - 167 Result(s)
S
[Spintoronics]
Electrical Spin Generation and Manipulation in SemiconductorsFeaturesSince spin orbit interactions caused by the structural inversion asymmetry and the bulk inversion asymmetry induce an effective magnetic field in III-Vsemiconductor heterostructures, it is possible to realize the new functional devices based on the electrical control of the spin precession. We study the electrical spin generation by using spatial modulation of spin orbit interaction, which demonstrates Stern-Gerlach spin filter in semiconductors, and research ultra-fast spin dynamics by using time resolved Kerr rotation microscopy. We also investigate a spin MOSFET based on the perpendicular magnetic materials and electric-field induced magnetization control. We can reduce the leak current and the signal delay in the logic circuit. With the non-volatility of the ferromagnetic source and drain electrodes, random access memory is also enabled by using the spin MOSFET structure. Targeted Application(s)/IndustryTarget application will be low power logic devices and non-volatile memory based on electron spins and also future metal-based spintronic devices. Department of Materials Science, Graduate School of Engineering
KOHDA, Makoto, Associate Professor
Doctor of Engineering
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[Spintronics]
Fabrication of Spintronics Materials by Artificial Nanostructure ControlFeaturesOur group works on the fabrication of materials and the fundamental study of physical phenomena for spintronics. Particularly, we are interested in magnetic ordered alloys, and fabricate nanolayered structures, tunnel junctions or composite device structures with those materials to investigate novel magnetic and magnetotransport properties. Recently we are also interested in the correlation between spin and heat currents, and investigate novel thermo-electric phenomena. Targeted Application(s)/IndustryWe hope to conduct collaborative research with a willing company for a practical application of new spintronic devices with low energy consumption and thermoelectric devices for energy harvesting. |
Novel-Concept Silicon Integrated Circuits Derived from the 3-Dimensional Device, Circuit and ArchitectureFeaturesIn recent year, facing the age of nanoscale engineering, the new technologies of device, circuit and architecture supported by novel physical guidance principles are highly expected, just as the similar situation as the predawn of semiconductor technology when Bardeen and Shockley discovered the secret of transistors. Therefore, in our research approach, the architectures, circuits, devices and CAD design tools for nanoscale LSI are systematically investigated in the following three main research subjects. Targeted Application(s)/IndustryCenter for Innovative Integrated Electronic Systems
ENDOH, Tetsuo, Professor
Doctor of Engineering
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Theoretical Design of New Materials and Device Functionality based on First-principles CalculationsFeaturesWe are doing theoretical research on electrical conductivity in magnetoresistive devices using highly spin-polarized materials. The aim is to achieve very functional spintronics devices such as read-out heads for ultrahigh-density magnetic recording and non-volatile spin memories. We also investigate magnetoresistive devices using perpendicularly magnetized materials to ensure endurance against thermal fluctuations of the magnetization. We successfully achieve a guideline for improvement of the magnetoresistive performance by designing the crystal structure at the interface between ferromagnets and oxides theoretically. Research Institute of Electrical Communication
SHIRAI, Masafumi, Professor
Doctor of Engineering
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Development of High Sensitive Magnetic Sensor Operating at Room Temperature with Tunnel Magnetoresistance DevicesFeaturesRecently, many tunnel magnetoresistance devices with high magnetoresistance effect are reported. These are expected to be applied to high sensitive magnetic sensors. There are many magnetic sensors with variety of the mechanism, in order to meet the demand of the very wide range of sensing magnetic field. However, there is no magnetic sensor which has high sensitivity, easy to use, operation at room temperature and low cost. Only a magnetic sensor with tunnel magnetoresistance devices can satisfy all the demand in principle. As the device has very wide range of the sensing magnetic field, it can be designed for any demand to the sensors. Targeted Application(s)/IndustryFor example, this device can sense a bio-magnetic field easily at room temperature, so that it could be replaced SQUID device, which is popular now but is very expensive and not easy to use personally. Therefore, by using this device, we expect we can conduct effective collaborative research in medical field. Department of Applied Physics, Graduate School of Engineering
ANDO, Yasuo, Professor
Doctor of Engineering
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Spintronics Devices and MaterialsFeaturesSpintronics is a technology utilizing electron spin which provided magnetic sensor, nonvolatile magnetic memory, and so on. Our studies are as below. Targeted Application(s)/IndustryMagnetic memory and storage. Microwave and Terahertz wave. Magnetic sensors. WPI Advanced Institute for Materials Research
MIZUKAMI, Shigemi, Professor
Doctor of Engineering
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[Spintronics device]
Spintronics deviceFeaturesTo realize ultralow-power and high-performance integrated circuit and information processing, spintronics physics, material, devices are studied. Research Institute of Electrical Communication
FUKAMI, Shunsuke, Associate Professor
Doctor of Engineering
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[Spintronics integrated circuits]
International industry-academic consortium (CIES consortium) enhances creation of innovative integrated electronic technologies from material/process/LSI to software/tool/system (Center for Innovative Integrated Electronic Systems: CIES)FeaturesIntegrated electronic systems are a fundamental technology that makes possible the lifestyles of ease and abundance we enjoy in the modern world. By leveraging innovative core technologies and longstanding accomplishments of industry-academic cooperation in Tohoku University as centripetal forces, we have promoted the CIES Consortium consisting of industry–academic collaborations, major national projects and community-based cooperation projects in the fields of Spintronics, AI hardware and Power Electronics through our cooperation with a diverse range of Japanese and foreign companies from fields such as materials, equipment, devices, circuits and systems. CIES has promoted world level Academic-Industrial Collaboration under establishment of world-first 300mm wafer process line and facilities for prototype manufacturing and characterizing spintronics integrated circuits compatible with world-class companies in university campus. Targeted Application(s)/IndustryCIES has conducted international industry-academic collaboration in the fields of integrated electronic technologies ranging from materials/equipment to devices/systems. In addition, we have promoted to cooperate with regional and local companies with support of local government (Miyagi Prefecture, Sendai City, Iwate Prefecture, etc) for contributing to Tohoku reconstruction and regional development. We welcome your participation in CIES consortium. Center for Innovative Integrated Electronic Systems
ENDOH, Tetsuo, Professor
Doctor of Engineering
|
[SR motor]
Research on High Performance Motor and its ApplicationsFeaturesElectric motors are essential devices in all areas such as industrial, traffic and civilian use. The demand of the electric motors is rising each year. In order to realize a high performance electric motor, we study the following items:
1. Development of a motor simulation method for accurate and fast calculation.
2. Considerations on an optimum control method of motors.
3. Application of the electric motor to an electric vehicle.
4. Regeneration and application of rotating mechanical energy.
The features of our study are a simulation method based on magnetic circuit model, SR motor without permanent magnet, and in wheel direct drive electric vehicle. Targeted Application(s)/IndustryAs we have basic skill for a magnetic field analysis, electric and electronic circuit analysis and control technic, our targeted applications are improvement of permanent magnet motor, SR motor and its applications to an electric vehicle and various mobilities. Small size generator is also our targeted application. |
[State analysis]
Development of new methods and apparatus for industrial elemental analysisFeaturesA goal of our research is to develop new instrumental methods in quantitative elemental analysis. We have suggested a new analytical method enabling trace elements at a few ppm level to be directly determined. We now study analytical applications of a low-pressure laser induced plasma as well as a glow discharge plasma associated with laser ablation, in order to carry out rapid analysis for the process control in material industries and for selection of scrapped materials. Targeted Application(s)/IndustryIndustry: We have already conducted cooperative research on industrial analyses with several metal-making companies as well as the iron and steel institute of Japan. We also hope cooperative works on practical analysis in various manufacturing fields. |
[Statistical Mechanics]
Optimizing everything / Optimal SocietyFeaturesAiming at developing practical quantum optimization technology known as quantum annealing, we are working on exploring basic technologies that can overcome the limitations and applications in collaboration with multiple companies. The advantage of the method is that it can be used simply by formulating a cost function that draws the goal to be optimized once, but we are not limited to the original method. We extend it by considering a much easier problem, sequential optimization by learning, black box optimization, etc.. In particular, it is being applied to automated driving, logistics in factories, and evacuation guidance during disasters. Targeted Application(s)/IndustryApplications to route search problems such as automatic driving of various vehicles, evacuation route guidance at the time of disaster, process scheduling and a large number of combination problems. We can provide a solution to combinatorial optimization in each industry. (Transportation / distribution, manufacturing, materials, drug discovery, etc.) Graduate School of Information Sciences, Applied Information Sciences, Information and Applied Technology, Physical Fluctuomatics
OHZEKI, Masayuki, Associate Professor
Doctor of Science
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[Statistical Science]
Data Analytics for Creation of Social ValuesFeaturesMy research field is a data analytics for creation of social values by data science approaches. In modern society, we can observe various data sets about our daily life, business or community. I aim to create new services for it using such data set and methods of Bayesian modeling, data mining or machine learning. Targeted Application(s)/IndustryGraduate School of Economics and Management
ISHIGAKI, Tsukasa, Associate Professor
Doctor of Philosophy
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[Steel Moment Resisting Frames]
Proposal of New Column Support System for Multi-Story Steel Moment Resisting Structures to Perform Beam Yielding MechanismFeaturesFor the moment resisting frames with fixed column bases, the soft story mechanism may occur during earthquake due to become plastic hinges at the bottom part of columns. This paper proposes the new support system on the first story whose columns consist of the reinforced concrete downside column and the steel topside column, and their joints with the anchor bolts and the shear plates are supposed to be pinned. It is possible for the frames with this support system to uniform the magnitude of the bending moment at column top and base, and to perform beam yielding mechanism for 6 and 9 story frames with 2.1 of the column-to-beam full plastic moment ratio. Targeted Application(s)/IndustryIn this column support system, the 1st story column consists of steel topside column and reinforced concrete downside column, whose connection at the midstory performs as a pin. New Industry Creation Hatchery Center
KIMURA, Yoshihiro, Professor
Doctor of Engineering
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[Steelmaking]
Composition and Structure Control of Steel and Other Metals Using Refining and SolidificationFeaturesThe production processes of base materials, such as iron- and steel-making processes, belong to an age of technical innovation toward an eco-friendly society. To support this innovation, fundamental studies are being conducted in our laboratory. The main subjects are "Process Design of Highly Efficient Reactors by Enlargement of Reaction Interface", "Recovery of Rice Field damaged by Tsunami using Steelmaking Slag", "Recovery of Rare Metals from By-product of Steelmaking Process", and "Control of Non-metallic Inclusions on Clean Steel Production". Targeted Application(s)/IndustryDirectly we are carrying out the collaboration with steelmaking companies, however, our technology can be applied to non-ferrous production and recycling process using high temperature treatment. Institute of Multidisciplinary Research for Advanced Materials
KITAMURA, Shinya, Professor
Doctor of Engineering
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s
[stainless steel]
Suppression of Intergranular Degradation of Polycrystalline Materials by Grain Boundary EngineeringFeaturesIntergranular degradation often results in decreased lifetime, reliability and economical efficiency of polycrystalline materials. In spite of persistent efforts to prevent such degradation, its complete suppression has not yet been achieved. Grain boundary studies have revealed that coincidence-site-lattice (CSL) boundaries have stronger resistance to intergranular degradations than random boundaries. The concept of ‘grain boundary design and control' has been refined as grain boundary engineering (GBE). GBEed materials which are characterized by high frequencies of CSL boundaries are resistant to intergranular degradations. Our group has achieved very high frequencies of CSL boundaries in commercial stainless steels by GBE. GBEed stainless steels showed significantly stronger resistance to intergranular corrosion (see Figs. 1 and 2), weld-decay, knife-line attack, stress corrosion cracking, liquid-metal embrittlement, radiation damage, etc. and much longer creep life (see Fig. 3) than the unGBEed ones. Targeted Application(s)/IndustryBy using this GBE processing, we expect to conduct effective collaborative research in related fields. Department of Materials Processing, Graduate School of Engineering
SATO, Yutaka, Professor
Ph.D.
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Development of the Nickel-Free Dental Magnetic Attachment Using the Magnetic Shielding Material which Lost its Magnetism by Nitrogen-Solid SolutionFeaturesIn the dental magnetic attachments which retain dentures, superstructures of dental implants, and so on, the non-magnetic stainless steel containing nickel is used in order to reinforce their retentive force by a magnetic circuit. The surface layer of magnetic stainless steel which loses its magnetism by nitrogen-solid solution obtained from heating in nitrogen gas at high temperature, enable to form a magnetic circuit, which does not contain nickel at all, and to reduce its components and manufacturing processes. The method using the nitrogen-solid solution in this study is warrantable to manufacture the nickel-free dental magnetic attachment with high safety. Targeted Application(s)/IndustryThe nickel-free magnetic attachment realizes a retainer with higher safety, and can expect the application to medical and dental care for clinical uses, such as not only a denture but a dental implant, an epithese, and so on with easy desorption. Division of Dental Biomaterials, Graduate School of Dentistry
TAKADA, Yukyo, Associate Professor
Doctor of Engineering
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[statistics]
Advanced Analysis of Socio-Economical Data for Capturing Social NeedsFeaturesWe have proposed advanced methods of behavior analysis for public transport service. Targeted Application(s)/IndustryWe welcome cooperative research on demand analysis of public services, as well as needs analysis for new goods and services. International Research Institute of Disaster Science
OKUMURA, Makoto, Professor
Doctor of Engineering
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[steel]
Advanced Control of Microstructure and Property of Structural Metallic MaterialsFeaturesMicrostructure represents various kinds of heterogeneities in the metallic materials, i.e., grains, component phase, lattice defects and chemical inhomogeneity such as impurity/alloying elements. It can be modified through control of phase transformation/precipitation and deformation/recrystallization by adjusting compositions of materials and/or through processing routes (heat treatment, deformation). Such expertise in micro/nanostructure control is very important in production of current materials from viewpoints of energy saving and recycling in structural materials such as steels and titanium alloys. Targeted Application(s)/IndustryPossibilities to establish new functions (e.g., superplasticity, shape memory/superelasticity) as well as superior mechanical properties (e.g., ultrahigh strength with high toughness/ductility) is also explored. |
[stent]
Biomodel for Development of Endovascular TreatmentFeaturesWe perform in-vitro or computational researches for development of medical devices. We develop a model of artery or bone to evaluate medical devices. And we apply optimization way for development of medical devices. Our main target is, currently, stent, or catheter. Targeted Application(s)/IndustryOur collaboration company can be; medical equipment, device, medical image, MEMS, standardization, medical training, or polymer. |
[step length]
Assessment of Physical Activities Using Wearable SensorsFeaturesMaintaining appropriate amount of physical activity is essential for health and disease prevention. Gait is the most common type of physical activity in everyday life. Monitoring the amount of physical activity in everyday lives may benefit mainly those who are at threat of metabolic syndrome and overweight. Towards better estimation of the amount of physical activity utilizing wearable sensors, we focused on taking running and walking economy into account. The relationship between step length and oxygen uptake was first determined. Step length estimation with moderate accuracy was accomplished using acceleration signals during walking. Step length was then taken into energy expenditure calculation as one of the variables. Targeted Application(s)/IndustryTogether with the basic version of the current locomotion monitoring system capable of counting staircase climbing up & down, we managed to upgrade our locomotion monitoring system into 3 dimensional. |
