Tohoku University. Research Profiles

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"S" Keywords - 160 Result(s)

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[Spintronics]

Theoretical Design of New Materials and Device Functionality based on First-principles Calculations

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We 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.
We believe that first-principles calculations, which need no empirical parameter, play a very important role in research and development of various materials. Please contact us if you want to collaborate with us.

Research Institute of Electrical Communication
SHIRAI Masafumi, Professor Doctor of Engineering

Spintronics Devices and Materials

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Spintronics is a technology utilizing electron spin which provided magnetic sensor, nonvolatile magnetic memory, and so on. Our studies are as below.

Noble & Rare-earth free magnetic films with large perpendicular magnetic anisotropy. We achieved to develop various Mn-bases alloy films exhibiting high perpendicular magnetic anisotropy (Fig.1 ).
THz range observation of magnetization motion. We achieved to detect a motion of magnetization using pulse laser in time domain (Fig. 2).
Novel organic spin devices. We achieved to fabricate hybrid junction consisting of an organic layer sandwiched by two inorganic magnetic layers and to observe magnetoresistance effect.
Tunnel Magnetoresistive devices: We are developing TMR devices with Mn-Ga alloys films (Fig.3 ).

Targeted Application(s)/Industry

Magnetic memory and storage. Microwave and Terahertz wave. Magnetic sensors.
We hope to conduct collaborative research with a willing company for a practical application of these devices and materials in industry.

WPI Advanced Institute for Materials Research
MIZUKAMI Shigemi, Professor Doctor of Engineering

Development of High Sensitive Magnetic Sensor Operating at Room Temperature with Tunnel Magnetoresistance Devices

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Recently, 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)/Industry

For 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

Novel-Concept Silicon Integrated Circuits Derived from the 3-Dimensional Device, Circuit and Architecture

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In 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.
1. Study on nanoscale device and circuit
Aiming at the nanoscale silicon semiconductor integrated circuit, we are mainly working on the following directions for new devices and circuits:
①Analysis for novel physical phenomenon based on nanostructural effects
②Device and circuit technology with new operating principle
③Restraint technology for increasing variability of device characteristics
④Architecture and circuit technology for robust information processing
2. Study on the 3-dimention-structual device and circuit
The elementary element of recent LSI with planar-structural devices is coming close to the physical limitation of scaling. In order to break the limit and sustain the evolution of future LSI performance, we have started the research on the novel 3-dimension-structural devices and circuits.
3. research on wireless integrated circuit (IC) based on information transmission
The ultracompact lightweight wireless IC is one of essential technologies for realizing the ubiquitous society which has the network available in anywhere, at anytime and from any surrounding items. For example, the IC tags for receiving information with reading function are getting close to the practical applications. In our laboratory, aiming at the automatic operating wireless IC with embedded power supply, we are systematically working on the following directions:
①The electrical power generation and storage devices
②Devices and circuits with Ultralow power consumption
③Sensing devices
For all above subjects, We hope to conduct collaborative researches with companies interested in our research.

Targeted Application(s)/Industry

Center for Innovative Integrated Electronic Systems
ENDOH Tetsuo, Professor Doctor of Engineering

[Spintronics device]

Spintronics device

Features

To realize ultralow-power and high-performance integrated circuit and information processing, spintronics physics, material, devices are studied.

Research Institute of Electrical Communication
FUKAMI Shunsuke, Professor Doctor of Engineering

[stainless steel]

Suppression of Intergranular Degradation of Polycrystalline Materials by Grain Boundary Engineering

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Intergranular 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)/Industry

By 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.

Development of the Nickel-Free Dental Magnetic Attachment Using the Magnetic Shielding Material which Lost its Magnetism by Nitrogen-Solid Solution

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In 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)/Industry

The 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

[Statistical Mechanics]

Optimizing everything / Optimal Society

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Aiming 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)/Industry

Applications 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, Professor Doctor of Science

[Statistical Science]

Data Analytics for Creation of Social Values

Features

My 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)/Industry

Graduate School of Economics and Management
ISHIGAKI Tsukasa, Associate Professor Doctor of Philosophy

[statistics]

[steel]

Advanced Control of Microstructure and Property of Structural Metallic Materials

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Microstructure 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.
We attempt to apply more advanced control of micro/nanostructures, such as atomic structures of crystalline interfaces, chemistory in an atomic scale (e.g., segregation) and so on. Fundamentals of microstructure formation (thermodynamics, kinetics, crystallography) are examined both theoretically and experimentally to clarify key factors for microstructure control. Another important aspect in our research is the improvement of mechanical property by microstructure manipulation.

Targeted Application(s)/Industry

Possibilities 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.

Institute for Materials Research
FURUHARA Tadashi, Professor PhD

[Steel Moment Resisting Frames]

[stent]

Biomodel for Development of Endovascular Treatment

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We 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)/Industry

Our collaboration company can be; medical equipment, device, medical image, MEMS, standardization, medical training, or polymer.

Institute of Fluid Science
OHTA Makoto, Professor Doctor of Engineering

[step length]

Assessment of Physical Activities Using Wearable Sensors

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Maintaining 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)/Industry

Together 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.

Graduate School of Biomedical Engineering
NAGATOMI Ryoichi, Professor M.D. & Ph.D.

[Stereoscopic Display]

Interactive Content to Enrich Our Lives

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(1) Displays and Interactive Techniques
Designing original display systems to show visual information accurately and effectively, and interaction techniques to make better use of these display systems.

(2) Interactive Video Content
Creating new interactive content from real video taken by cameras and computer-generated animations.

(3) Modeling and Controlling the “Atmosphere” in a Conversation Space
Aiming to stimulate the “atmosphere” in a conversation space by supplying real-time feedback to the users, we are exploring means of sensing and analyzing change in the space.

(4) Designing and Evaluating Novel Interaction Techniques
Designing and evaluating novel interaction techniques on target selection for variety types of displays including large and touch displays.

Targeted Application(s)/Industry

Research Institute of Electrical Communication
KITAMURA Yoshifumi, Professor Doctor of Engineering

[Sterilization]

Development of next-generation sterilization method by a plasma flow at atmospheric pressure

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Plasma sterilization has been developed as an alternative sterilization method due to its chemical activity, operation at low temperature and atmospheric pressure, low power consumption, low cost and safety. We have studied a mechanism of chemical species generation and transport in a plasma flow and, the sterilization efficacy and mechanism for several plasma sources at atmospheric pressure, such as a microwave plasma flow, a dielectric barrier discharge in a tube and a water vapor plasma flow. We already clarified that the damages of outer membrane and destructions of the cytoplasmic membrane of Escherichia coli by exposure to the microwave plasma flow. Fig. 1 shows the effect of plasma exposure on the E. coli. When the E. coli was exposed to the plasma, the height of the E. coli decreased and the potassium leakage of cytoplasmic material increased. For sterilization in a tube, we also clarified that an induced flow in the narrow tube by DBD transports chemical species and sterilize the whole inside surface of a tube as shown in Fig. 2. We hope to conduct collaborative research with a willing company for a practical application of this technology in industry.

Institute of Fluid Science
SATO Takehiko, Professor Doctor of Engineering

[Steroid]

Hormone Actions in Human Breast Carcinoma

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Breast cancer is one of the most common malignancies in women worldwide. Therefore, it is very important to investigate biological features of breast carcinoma in order to improve clinical outcome of the patients. It is well known that estrogens play important roles in the development of human breast carcinomas, and endocrine therapies are frequently used in these patients to block the intratumoral estrogen actions. In the Division of Pathology and Histotechnology, we analyze hormone actions in breast carcinoma by pathological methods as well as various molecular biological techniques.

Targeted Application(s)/Industry

It will be possible to newly develop diagnostic techniques regarding prediction of prognosis and/or effectiveness of treatment in breast cancer patients.

Pathology and Histotechnology, Graduate School of Medicine
SUZUKI Takashi, Professor MD, PhD

[Streaming]

Internet video streams have identities like fingerprints

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According to recent studies, each video that is streamed online has its own unique characteristic. The pattern of data that are sent through the network can vary from one encoding method to another and the change from scene to scene, which is a unique characteristic of each video. This research aims to identify video content in the network without looking at the data itself.

Targeted Application(s)/Industry

This research would be especially useful in preventing illegal distribution of television program such as illegal channel without violating user privacy. Another application would be to prevent confidential online meeting from leaking outside local enterprise network. In addition, it is also possible to investigate the circulation of a video content using method introduced by this work.

Graduate School of Information Sciences
KATO Nei, Professor Doctor of Engineering

[strengeness nuclear physics]

Experimental Nuclear Physics

Features

1) Study of strangeness nuclear physics and hypernuclei with high energy electron/photon beams

2)加速器研究施設で収集される大量のデータ解析技術、
  荷電粒子、高エネルギー光子の測定技術、

Targeted Application(s)/Industry

Department of Physics, Graduate School of Science
NAKAMURA Satoshi N., Professor Doctor of Science

[strength]

Advanced Control of Microstructure and Property of Structural Metallic Materials

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Features

Microstructure 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.
We attempt to apply more advanced control of micro/nanostructures, such as atomic structures of crystalline interfaces, chemistory in an atomic scale (e.g., segregation) and so on. Fundamentals of microstructure formation (thermodynamics, kinetics, crystallography) are examined both theoretically and experimentally to clarify key factors for microstructure control. Another important aspect in our research is the improvement of mechanical property by microstructure manipulation.

Targeted Application(s)/Industry

Possibilities 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.

Institute for Materials Research
FURUHARA Tadashi, Professor PhD