Search results for: K. Inomata

Items from 1 to 20 out of 66 results

chapter

Electrical manipulation of magnetization switching in Co₂FeAl alloy based magnetic tunnel junctions with in-plane and perpendicular magnetization

Z. Wen, H. Sukegawa, S. Kasai, K. Inomata, more

2015 IEEE Magnetics Conference (INTERMAG) > 1

INTERMAG 2015 - IEEE International Magnetics Conference

Electrical manipulation of magnetization switching, such as spin-transfer torque (STT) switching, electric-field-assistant magnetization switching, and spin-orbit torque (SOT) switching, has been attracting great attentions due to its applications in low-power-consumption spintronic devices, such as magnetoresistive random access memories (MRAMs) and non-volatile magnetic-logic circuits. Recent investigations...

article

P0022 : Whole organ engineering using decellularized scaffold for liver transplantation in large animal model

K. Inomata, H. Yagi, K. Tazima, K. Sugiyama, more

Journal of Hepatology > 2015 > 62 > Supplement 2 > S299

article

Fabrication of pseudo-spin-MOSFETs using a multi-project wafer CMOS chip

R. Nakane, Y. Shuto, H. Sukegawa, Z.C. Wen, more

Solid State Electronics > 2014 > 102 > Complete > 52-58

We demonstrate monolithic integration of pseudo-spin-MOSFETs (PS-MOSFETs) using vendor-made MOSFETs fabricated in a low-cost multi-project wafer (MPW) product and lab-made magnetic tunnel junctions (MTJs) formed on the topmost passivation film of the MPW chip. The tunneling magnetoresistance (TMR) ratio of the fabricated MTJs strongly depends on the surface roughness of the passivation film. Nevertheless,...

article

O41 ENGINEERED LIVER GRAFT USING DECELLULARIZED ORGAN SCAFFOLD IN LARGE ANIMAL MODEL

K. Inomata, H. Yagi, M. Hirayama, T. Hibi, more

Journal of Hepatology > 2014 > 60 > 1 Supplement > S17

chapter

Enhanced fault ride through capability of matrix converter for wind power system

K. Inomata, H. Hara, S. Morimoto, J. Fujii, more

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society > 4838 - 4843

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society

The matrix converter has many advantages in wind power system applications. Matrix converter is compact and highly efficient because it directly converts power from AC generator to the grid without intermediate DC bus while conventional back-to-back converter system requires a lot of electrolytic capacitors in DC link bus which are bulky and have short life-time. Matrix converter has both motoring...

chapter

Monolithic integration of pseudo-spin-MOSFETs using a custom CMOS chip fabricated through multi-project wafer service

R. Nakane, Y. Shuto, H. Sukegawa, Z. C. Wen, more

2013 Proceedings of the European Solid-State Device Research Conference (ESSDERC) > 272 - 275

ESSDERC 2013 - 43rd European Solid State Device Research Conference

We demonstrated monolithic integration of pseudo-spin-MOSFETs (PS-MOSFETs) using vendor-made MOSFETs fabricated in a low-cost multi-project wafer (MPW) product and lab-made magnetic tunnel junctions (MTJs) formed on the topmost passivation film of the MPW chip. The tunneling magnetoresistance (TMR) ratio of the fabricated MTJs strongly depended on the surface roughness of the passivation film. Nevertheless,...

chapter

Microwave response of an impedance-matched Δ-system in circuit QED

K. Koshino, K. Inomata, T. Yamamoto, Y. Nakamura

2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR) > 1 - 2

2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

A driven qubit-resonator system functions as an impedance-matched Δ-system under certain conditions. We analyze the microwave response of such a system and reveal the possibility of deterministic down-conversion of microwave photons upon a single reflection.

chapter

Design and performance of pseudo-spin-MOSFETs using nano-CMOS devices

Y. Shuto, S. Yamamoto, H. Sukegawa, Z. C. Wen, more

2012 International Electron Devices Meeting > 29.6.1 - 29.6.4

2012 IEEE International Electron Devices Meeting (IEDM)

The design and performance of pseudo-spin-MOSFETs (PS-MOSFETs) using nano-CMOS devices were computationally investigated. The operations of a PS-MOSFET with current-induced magnetization switching were also experimentally demonstrated by the hybrid integration of a vendor-made MOSFET and our-developed spin-transfer-torque magnetic tunnel junction. The nonvolatile SRAM and delay flip-flop applications...

chapter

Sliding mode compensator for improving robustness of phase locked loop for encoderless servo drive

N. A. Baloch, K. Inomata, S. Morimoto, K. Ide, more

IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society > 3711 - 3716

IECON 2012 - 38th Annual Conference of IEEE Industrial Electronics

This paper presents new method for improving robustness of phase locked loop (PLL) used in encoderless control algorithm for estimating position and speed. The state based observer used as a PLL is modified by using sliding mode compensator. The sliding mode compensator is designed by using motor torque and PID compensator used in the state based observer. The proposed method is compared with the...

article

Accuracy of 2-Dimensional Object Location Estimation Using Leaky Coaxial Cables

K Inomata, Y Yamaguchi, H Yamada, W Tsujita, more

IEEE Transactions on Antennas and Propagation > 2011 > 59 > 6-2 > 2396 - 2403

The improvement of position estimation accuracy is a very important factor in various radar applications. This paper focuses on two-dimensional (2-D) location estimation in radar surveillance using leaky coaxial cables. A leaky coaxial cable is a kind of antenna and has recently attracted attention as a powerful tool for vehicle detection and as an intrusion detection sensor for perimeter security...

article

Anomalous magneto-transport properties in nearly gapless materials

M. Sasaki, A. Ohnishi, N. Satoh, K. Suga, more

Physics Procedia > 2010 > 3 > 2 > 1305-1310

We have measured magnetoresistance (MR) for semimetals Bi and graphite, nearly gapless materials Bi-Sb and Bi-Te alloys, and narrow gap semiconductor Ag ₂ Se single crystals at 4.2 K and up to 4 T. We have observed a giant MR for Bi, a giant linear MR (LMR) for Bi-Sb alloy and Ag ₂ Se single crystals. Anomalous completely linear weak-field LMR has been found for nearly gapless materials:...

article

Giant transient Nernst–Ettingshausen effect in nearly gapless materials

M. Sasaki, A. Ohnishi, N. Satoh, K. Suga, more

Physics Procedia > 2010 > 3 > 2 > 1311-1316

We have measured a pulsed laser induced transient Nernst-Ettingshausen (TNE) effect for semimetal Bi and for nearly gapless materials Bi-Sb and Bi-Te alloy single crystals at 4.2 K and under magnetic fields up to 4 T. We have found the giant longitudinal-TNE (l-TNE) and transverse-TNE (t-TNE) signals for all materials. The l-TNE signals show a quite unusual antisymmetric magnetic field dependence,...

article

Progress and application of the Tohoku microbeam system

S. Matsuyama, K. Ishii, H. Yamazaki, Y. Kikuchi, more

Nuclear Inst. and Methods in Physics Research, B > 2007 > 260 > 1 > 55-64

A microbeam system was constructed at the Tohoku University Dynamitron laboratory and optimization of the system was performed. Parasitic field contamination from tungsten carbide slit chips and an annular Si surface barrier detector limited the beam spot size to 2×2μm ² . By replacing these components, the parasitic field contamination of the system was reduced and the performance of the...

article

Transmission electron microscopy of Co2(Cr1−xFex)Al sputtered films and their magnetic tunneling junctions

Y.K. Takahashi, T. Ohkubo, K. Hono, S. Okamura, more

Journal of Magnetism and Magnetic Materials > 2007 > 313 > 2 > 378-382

The microstructures of Co ₂ FeAl and Co ₂ (Cr _0.4 Fe _0.6 )Al sputtered films and of their magnetic tunnel junctions (MTJs) have been investigated to discuss the possible reasons for an unexpectedly low tunneling magnetoresistance (TMR). The structure of the Co ₂ FeAl film changed from B2 to L2 ₁ with increasing substrate temperature, while that of the...

chapter

Wide Area Intruder Detection System with a Pair of Transceiver Cables

T. Hirai, K. Inomata, N. Miyake, K. Sumi, more

2007 IEEE Conference on Technologies for Homeland Security > 76 - 80

2007 IEEE Conference on Technologies for Homeland Security

We have developed a wide area intruder detection surveillance system which was delivered to the Japanese market last summer. This technology is known as MELWATCH which stands for MELco WATCH(to keep lookout). It has been installed at several sites in Japan. MELWATCH is composed of a pair of sensor cables, a sensor unit and an intrusion detection terminal. The sensor cables are composed of a transmission...

article

Preparation of Fe/Ni–Zn–Cu ferrite stacked films by aerosol deposition method

S. Sugimoto, V. Chan, M. Noguchi, N. Tezuka, more

Journal of Magnetism and Magnetic Materials > 2007 > 310 > 2 Part 3 > 2549-2551

Composite or stacked films composed of Fe and Ni–Zn–Cu ferrite were prepared by aerosol deposition (AD) method, and the relationship between magnetic properties and microstructure was investigated. Aiming to control the microstructure, two aerosol chambers and double nozzles, from which each powder ejected independently, were used in the AD system. With increase in the vibration frequency of Fe aerosol...

article

Tunnel magnetoresistance in magnetic tunnel junctions with Co2Fe (Al, Si) full-Heusler films

N. Tezuka, N. Ikeda, A. Miyazaki, S. Okamura, more

Journal of Magnetism and Magnetic Materials > 2007 > 310 > 2 Part 3 > 1940-1942

The magnetoresistance effect for a magnetic tunnel junction (MTJ) with Co ₂ FeAl _0.5 Si _0.5 electrodes on Cr buffered MgO (001) substrate has been investigated. The MTJ with B2-type Co ₂ FeAl _0.5 Si _0.5 electrode exhibited tunnel magnetoresistance (TMR) ratio of 76% at room temperature (RT) and 106% at 5K, while that with L2 ₁ structure showed...

article

Fabrication and Characterization of Co-Ferrite Thin Films for a Ferromagnetic Barrier in a Spin-Filtering Device Operating at Room Temperature

R. Goto, Y.K. Takahashi, N. Tezuka, K. Inomata, more

IEEE Transactions on Magnetics > 2007 > 43 > 6 > 2797 - 2799

For development of a spin-filtering device with a ferromagnetic barrier, very thin Co-ferrite layers are prepared by the plasma oxidization of the CoFe₂ surface deposited on MgO(001) single crystal substrates and postannealing process. Spin-filtering junctions consisting of CoFe₂/(MgO/)Co-ferrite/Ta are fabricated and exhibit nonlinear J-V curves. By the insertion of a MgO layer, clear independent...

article

Hard axis magnetic field dependence on current-induced magnetization switching in MgO-based magnetic tunnel junctions

Y. Saito, T. Inokuchi, H. Sugiyama, K. Inomata

The European Physical Journal B > 2007 > 59 > 4 > 463-469

. We conducted a detailed study of hard axis magnetic field (H_hard) dependence on current-induced magnetization switching (CIMS) in MgO-based magnetic tunnel junctions (MTJs) with various junction sizes and various uniaxial anisotropy fields. The decreases in critical current density (J_c) and the intrinsic critical current density (J_c0) estimated from the pulse duration dependence on J_c in CIMS are...

chapter

2-Dimensional Measuring Method Using a Wide-area Surveillance Sensor with Leaky Coaxial Cables

K. Inomata, T. Hirai, H. Yamada, Y. Yamaguchi

2006 European Radar Conference > 202 - 205

Proceedings of the 3rd European Radar Conference

We have developed a wide-area surveillance sensor with a pair of leaky coaxial cables (LCX). It detects targets in the surveillance area by scattering signals generated by targets whose positions are measured using propagation delay time. Such a sensor has been studied previously; however, several problems remain. The primary issue is two-dimensional sensing which in practice is desired to improve...

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INFONA - science communication portal

Search results for: K. Inomata

Electrical manipulation of magnetization switching in Co₂FeAl alloy based magnetic tunnel junctions with in-plane and perpendicular magnetization

P0022 : Whole organ engineering using decellularized scaffold for liver transplantation in large animal model

Fabrication of pseudo-spin-MOSFETs using a multi-project wafer CMOS chip

O41 ENGINEERED LIVER GRAFT USING DECELLULARIZED ORGAN SCAFFOLD IN LARGE ANIMAL MODEL

Enhanced fault ride through capability of matrix converter for wind power system

Monolithic integration of pseudo-spin-MOSFETs using a custom CMOS chip fabricated through multi-project wafer service

Microwave response of an impedance-matched Δ-system in circuit QED

Design and performance of pseudo-spin-MOSFETs using nano-CMOS devices

Sliding mode compensator for improving robustness of phase locked loop for encoderless servo drive

Accuracy of 2-Dimensional Object Location Estimation Using Leaky Coaxial Cables

Anomalous magneto-transport properties in nearly gapless materials

Giant transient Nernst–Ettingshausen effect in nearly gapless materials

Progress and application of the Tohoku microbeam system

Transmission electron microscopy of Co2(Cr1−xFex)Al sputtered films and their magnetic tunneling junctions

Wide Area Intruder Detection System with a Pair of Transceiver Cables

Preparation of Fe/Ni–Zn–Cu ferrite stacked films by aerosol deposition method

Tunnel magnetoresistance in magnetic tunnel junctions with Co2Fe (Al, Si) full-Heusler films

Fabrication and Characterization of Co-Ferrite Thin Films for a Ferromagnetic Barrier in a Spin-Filtering Device Operating at Room Temperature

Hard axis magnetic field dependence on current-induced magnetization switching in MgO-based magnetic tunnel junctions

2-Dimensional Measuring Method Using a Wide-area Surveillance Sensor with Leaky Coaxial Cables

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